1.
She stopped and racked her brain.
思嘉停下来苦苦思索。
2.
The old man appeared to think deeply.
老头儿似乎在苦苦思索。
3.
The regimental commander racked his brains over the problem of crossing the river.
团长苦苦思索渡河问题。
4.
Helene frowned and thought hard.
海伦颦眉苦苦思索。
5.
We finally puzzled out the meaning of the poem.
我们苦苦思索终于理解这首诗的意思。
6.
He cudgeled his brains to understand how on earth such a thing could happen.
他苦苦思索这件事到底怎么会发生的。
7.
I'm trying to think how to get there.
我在苦苦思索怎么才能到达那儿。
8.
The old general was puzzling over the old map.
老将军对着那张旧地图苦苦思索着。
9.
He ransacked his memory for suitable words.
他苦苦思索寻找恰当的词语。
10.
I keep puzzling over his strange behavior.
我一直在苦苦思索他那奇怪的举止。
11.
The commander racked his brains over the problem of crossing the river.
司令员苦苦思索渡江问题。
12.
think deeply about sth in order to understand it
对某事物苦苦思索（以便理解）
13.
He puzzled over her absence.
他苦苦思索她缺席的原因。
14.
They sought the woods, and revolved the oracle in their minds.
他们躲进树林，苦苦思索着神谕的含义。
15.
She troubled herself over what else to put in the letter.
她苦苦思索，不知在信里写点什么。
16.
The boy struggled with the question and at last found the answer.
那个小孩苦苦思索问题，终于终到了答案。
17.
We've been scratching our heads for a solution to the problem.
我们一直苦苦思索, 想找到解决这一问题的方法.
18.
When you think hard or feel displeased, you may knit your forehead.
当你苦苦思索或感到不快时，你会皱起眉头。