棒球赛中，一个投球手（pitcher）每局（inning）walk 2 batters, 是什么意思呢？

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号码 中文 英文(完整/简称)
1 投手 Pitcher / P
2 捕手 Catcher / C
3 一垒手 First-Base Man / 1B
4 二垒手 Second-Base Man / 2B
5 三垒手 Third-Base Man / 3B
6 游击手 Shortstop/ SS
7 左外野 Left-Fielder / LF
8 中外野 Center-Fielder / CF
9 右外野 Right-Fielder / RF

棒球术语代码
术语/ 英文/ 中文解释
A/assists/助 杀
AB/at bats/打 数
AL/American League /美国联盟
1B/first baseman/一垒手 / 一垒安打
2B/second baseman/二垒手 / 二垒安打
3B /third baseman/三垒手 / 三垒安打
B/balls/坏球数
BA/batting average/打击率
BB/bases on balls/四坏球
BF/batters faced/投球人次
BFS/batters faced per start/投手过劳指数
BK/Balks/投手犯规数
BS /blown saves /救援失败
C/catcher/ 捕手
CF/center fielder/中外野手
CG/complete games/完投场次
CS/ caught stealing/盗垒失败
DH/designated hitter/指定打击
DL/disabled list/受伤名单
DP /double plays/双杀
E/errors/失误
ER/earned runs/投手责任失分
ERA/ earned run average/投手防御率
FA/ free agents/自由球员
FB/fly balls hit against pitcher/投手被击出飞球
FPCT/fielding percentage /守备率
G/games/出赛次数
GF/grounders to flies ratio/滚地球对飞球之比率
GB/games behind ; groundballs/球队胜差 ; 投手被击出滚地球
GDP/times grounded into double plays/击出双杀打的次数
GM/general manager/球队总教练
GS/ games started /投手先发场次
H/hits ; holds/安打 / 投手被安打 ; 中继成功
HBP/hit by pitch/触身球
HP/times hit by pitch/触身球次数
HR /home runs/全垒打 ; 投手被全垒打
IBB/intentional bases on balls/故意四坏球
IF/infielder/ 内野手
IP/innings pitched/投球局数
IR/inherited runners//救援投手上场时已在垒上的跑者
INT/Interference/妨碍
IS/ inherited runners who scored/救援投手让IR得分的数量
K /killed 三振 / 打击手被三振
L/loses/败投 / 败场
LF/left fielder/左外野手
LOB/ left on bases /残垒数
MLB/Major League Baseball/美国职棒大联盟
MVP/ most valuable player/最有价值球员
NL/ National League/ 国家联盟
OB/妨碍跑垒
OBP/on base percentage/上垒率 / 投手被上垒率
OF/ outfielder /外野手
PA/plate appearances/打席
PO/put outs/使出局数
PPO/pitcher pickoffs/投手牵制成功数
PSS/ probability of a successful steal/盗垒成功率
R/runs//得分 / 投手失分
RBI/runs batted in/ 打者打点 / 投手被打点
RF/right fielder/右外野手
ROY/Rookie Of the Year/年度新人王
RPA/ run production average/攻分率
SB/stolen bases/盗垒成功 / 投手被盗垒数
SF/sacrifice flies/高飞牺牲打数 / 投手被高飞牺牲打数
SH/sacrifice hits/牺牲触击 / 投手被牺牲触击数
SHO/shoutouts/投手完封场数
SLG/slugging percentage/长打率 / 投手被长打率
SO/strike outs/三振 / 打击手被三振
SP/save points/救援点
SS/shortstop/游击手
SV/saves/救援成功
SVOP/ save opportunities /救援成功率
TA/total average/ 攻击率
TB/total bases/垒打数
TBF/total batters faced/投球人次
TC/ total chances/守备机会
W/wins ; walks/胜投 / 胜场 ; 保送 / 打击手被保送
WP/wild pitches/暴投
WS /World Series/美国大联盟冠军赛(世界大赛)

MLB 名词解释
Umpire = 裁判
Head Coach = 总教练
Line Up = 先发阵容
Rosters = 球队阵容
Head Coach = 总教练
Pitching Coach = 投手教练
Bating Coach = 打击教练
Rotatino = 先发投手轮替序
SP/ Starting Pitcher = 先发投手
RP/ Relief Pitcher = 中继投手
CP/ Closer (Closer Pitcher) = 救援投手
INF/ Infielder = 内野手
OF/ Outfielder = 外野手
Bench Player = 替补选手
Utility Player = 非先发选手
C/ Catcher = 捕手
1B/ First Baseman = 一垒手
2B/ Second Baseman = 二垒手
3B/ Third Baseman = 三垒手
SS/ Short Stop = 游击手
LF/ Left Fielder = 左外野手
CF/ Center Fielder = 中外野手
RF/ Right Fielder = 右外野手
DH/ Designated Hitter = 指定打者
PH/ Pinch Hitter = 代打
PR/ Pinch Runner = 代跑
Switch Hitter = 左右开弓打者
Lefty (美俚语) = 左投手
Lead Off Man (美俚语) = 一棒打者
Slugger (美俚语) = 指长打力很强的打者
Clean Up Batter (美俚语) = 指具有高打点能力的打者
Batting Up = 站上打击区

统计篇:
打击及防守部分:
AB/ At Bat = 上场打击次数
H/ Hit = 安打数
DB/ Double/ 2 Base Hit = 二垒安打
TB/ Tripple/ 3 Base Hit = 三垒安打
HR/ HomeRun = 全垒打
R/ Run = 得分
RBI/ Runner Batted In = 打点
G/ Game/ GP/ Game Played = 出赛场数
SH/ Sacrifice Hi = 牺牲打
SF/ Sacrifice Fly = 高飞牺牲打
FO/ Fly Out = 飞球
GO/ Ground Out = 滚地球
SB/ Steal Base = 盗垒
DPB/ Double Play Bat = 双杀打
SLG/ Sluggling Percentage= 长打率
AVG/ Batting Average = 打击率
OBP/ On Base Percentage = 上垒率
GWH/ Game Wining Hit = 胜利打点
E/ Error = 失误
DP/ Double Play = 双杀
TP/ Tripple Play = 三杀
CS/ Caught Stealing = 阻杀
A/ Assist = 助杀
FLD/ Fielding Percentage = 守备率
Hit a Cycle: 完全打击
Back to Back Homerun = 连续两棒击出全垒打
Grand Slam = 满垒全垒打
Solo Homerun/ Solo Shot (美俚语) = 阳春全垒打
3 Run Blast (美俚语) = 三分全垒打
Go Ahead Run = 超前分
Go Ahead Homerun = 超前分全垒打
Tied Run = 追平分
Scoring Pisition = 得点圈
Runner = 跑者
Ground Rule Double = 场外二垒打
Infield Hit = 内野安打
Line Drive = 平飞打
Infield Fly = 内野高飞球
Base Hit = 一垒安打
Off the Wall = 击中全垒打强的球
DP/ Double Play = 双杀
TP/ Tripple Play = 三杀
CS/ Caught Stealing = 阻杀
A/ Assist = 助杀
FLD/ Fielding Percentage = 守备率
Hit a Cycle: 完全打击
Bunt = 触击短打
Squeeze Play = 以牺牲短打来使三垒跑者回本垒得分
Hit and Run = 打带跑
Short Hop = 很近防守员的低弹跳球
Charge = 趋前防守
Diving Catch = 飞扑防守
Frozen Hit (美俚语) = 指非常强劲的穿越安打
Hit to Another Zip Code (美俚语) = 指场外全垒打
Fair = 界内
Foul = 界外

投手部分:
ERA/ Earned Run Average = 投手防御率
IP/ Inning Pitched = 投球局数
CG/ Complete Game = 完投
SHO/ Shout Out = 完封
GS/ Game Started = 先发场数
DB/ Dead Ball/ HIP/ Hit by Pitch = 死球
BB/ Base Balled/ Walk/ = 四坏球
B/ Bulk = 投手犯规
R/ Run = 失分
ER/ Earned Run = 自责分
SV/ Save = 救援成功
H/ 被安打(如此项统计数字在投手)
W/ Win = 胜场
L/ Lose = 败场
Wild Pitch = 暴投
Perfect Game = 完全比赛
Heater (美俚语) = 指快速直球
Off Speed (美俚语) = 指慢速球
Breaking Ball (美俚语) = 指变化球
Chin Music (美俚语) = 指非常近打者颈部以上的球
Pitch Out = 牵制出局

基本上是这样，walk 2 batter的准确解说就是将对方两位击球手保送1垒。
不过纠正一个说法，好球就是膝盖以上腹部以下，本垒两端之间的区域，超出一点就是坏球。所以并不一定是投手的问题。而且，投出4坏球可能有战术需要。比如说现在没人上垒，1人出局，投手面对的是一个经常打出本垒打的人，而下一个击手又很少打出安打，那这时投手就会投出4坏球，而希望制造双杀。

学习中，等待高人回答