抄写得不准确吧?sleep后应有一个冒号或者破折号?
it形式主语
it系动词
true表语
that后,主语从句
从句中:
scientists(主) have long pondered (谓)the mystery of sleep(宾) why we do it and why it’s necessary(mystery的同位语)
都是做状语
Equipped 非谓语做句子的状语
with a pair of binoculars做伴随状语
only做副词
and是连词
ready做副词
to spend long hours 非谓语做目的状语
waiting 非谓语做做目的状语
in all weathers做状语
for a precious glance of a rare bullfinch做状语
希望对你能有所帮助。