1.Then she was released and just dropped off the face of the Earth.
然后她就了无音讯了。

drop off
落下

e.g.Yen dropped off.
日元下跌。

2.I'm kind of tied up...
我最近有点忙……

be tied up
忙碌

e.g.I'll be tied up all day.
我一整天都会很忙。

3.He hits on every girl in school and you know it.
他勾搭学校里的每个女孩子，你又不是不知道。

hit on somebody
勾搭、搭讪、调情

e.g.Dave has hit on most of the women in the department.
Dave勾搭了部门里大多数的女士。

4.She was a different person back then.
她那时候和现在可不一样。

back then
那时

e.g.Back then, she was a struggling single mother who wrote in cafes to save on the heating bill at home.
那时，作为一个单身母亲她很辛苦，为了节省家里供暖的开销，她到咖啡厅里去写作。

5.If you really like Nick,then I'll get on board with it.
如果你真心喜欢Nick，那么我支持你们。

get on board
加入（团队）

e.g.Please get on board and help us out.
请一起参与帮助我们。

6.You dragged me all the way out here,so let's get to the bottom of it.
是你把我拖到这里来的，我们一定要弄个水落石出。

get to the bottom of something
让...水落石出

e.g.I never got to the bottom of this!
我从来就没弄清楚到底怎么回事！

7.I know I don't come across as I care about much...
我知道我看上去好像不怎么关心……

come across as
好像；似乎

e.g.She sometimes comes across as being rather arrogant.
她有时候看上去相当自大。