例句與用法

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1. He recalled the occurrences before he fell asleep .
   他想起了入睡之前的種種經過。
2. More important are tablets of above 1400 b.c .
   公元前1400年之前的石碑具有更重要的意義。
3. It may also refer to the item before the one being discussed .
   它也可指正在談及的事物之前的一個。
4. Careful reconnaissance is essential before observations begin .
   觀測開始之前的一項主要工作是認真選點。
5. That was before i took a course in public speaking at the dale carnegie institute .
   那是我在戴爾卡內基學院選修演說術之前的事。