区别：
pine tree是pine的词组，指松树、常青树。
pine是一个单词，解释有：
（1）vi. 渴望，痛苦；憔悴
（2）n. [林] 松树；凤梨，菠萝
（3）vt. 为…悲哀；哀悼
（4）adj. 松木的；似松的
pine tree
（1）音标：英 [paɪn] [triː]； 美 [paɪn] [tri]
（2）例句：
① After a lovely stretch running right along the edge of Lake Baikal we moved away from birchand pine tree territory into lusher pastures.
在沿着贝加尔湖的一段美妙行程之后，我们离开了桦树和松树的地域，进入了令人迷醉的大草原。
②“The motifs of eagle and pine tree were chosen for their symbolic value in both China andAmerica,” added Cai.
蔡国强又说，选用鹰与松树作为主题是因为它们在中国和美国都具有象征意义。
③ You smell familiarityin the air, the scent of a large pine tree in the neighbor’s yard.
你在空气中闻到熟悉的气息，邻居家院子里一刻大松树的气味。
④ Famous pine tree such as the“Flying Dragon” and the“Twin Dragons”are found there.
在莲花峰，还能看到一些名闻遐迩的松树，如“飞龙松”和“双龙松”。
⑤ The tradition of having a pine tree as a Christmas Tree is believed to come from Germany.
把松树作为圣诞树的传统普遍认为来自德国。
pine
（1）音标：英 [paɪn]； 美 [paɪn]
（2）例句：
① A tall pine dominated the landscape. 一棵高耸的松树俯视全景。
② I ordered the same rustic pine in a thicker profile to trim the windows, door and corners.
我还要了装饰门窗和屋角的木板，同样是质朴的松木，但剖面要厚一些。
③ They set up camp in a pine grove, laying their blankets beneath the canopy of branches.
他们在一片松树林间搭起了帐篷，把毛毯铺在树冠下面。
④ It is the meeting point of waves and coast, wind and pine-trees, ideas and people, variousmusic rhythms and audition.
它是波浪与海岸、风与松树、想法与人、各种各样音乐节奏与聆听的交汇点。
⑤ The bottle is made from switch grass, pine bark, corn husks and other materials.
这个瓶子由柳枝，松树树皮和玉米秸秆以及其他的材料制成。
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