1.以先后顺序为准。
First come, first served. *按到达的先后顺序、按报名顺序，直译是第一个来的，第一个得到供应。
Do you take reservations? (你预订了吗?)
No, first come, first served. (没有，先来的先得。)
On a first-come, first-served basis.

2.过时了。
It's out of date.
Look at my camera. (你看我的照相机。)
But it's out of date already. (可它都过时了。)
It's old-fashioned.
It's outdated.
It's behind the times.

3.电视有长处，也有短处。
TV has its merits and demerits.
TV has its good and bad points.
There are good and bad points about TV.

4.我利用了他的弱点。
I took advantage of his weakness. *take advantage of...利用……。