1.prehistoric times 史前时代

例句：Perhaps originally a sanctuary, it became a necropolis in prehistoric times.
这座地下宫殿可能曾是避难所，但从史前时期起成为了大墓地。

2.go through 经受；经历

例句：You must go through customs in order to pass across the border.
你过边境就必须在海关办理手续。
3.in order to 为了；以便；目的是...

例句：He was going for a scholarship in order to go abroad.
为了出国，他准备争取奖学金。

4.get to know 认识；了解

例句：He's quite a nice guy when you get to know him.
你了解了他,你就知道他是个不错的人。