求一个英语问题(急~)

1 at any time: 在任何时候
You're welcome at any time.
随时欢迎你回来。
You can call me (at) any time.
你可以随时打电话给我。
2 at a time: 每次,一次
Female sheep produce one or two lambs at a time.
母羊一次生一到两只羊羔。
Works on one painting at a time.
一次只创作一幅。
3 on the other hand:另一方面
On the other hand, he got this far.
另一方面，他获得了更大的进步。
4 in the way: ad. 在路上(挡道的)
Please don't stand in the way.
请别站在那挡着路。

At any time, i will be there to help you if you need it

He helped her at a time when she need it

patato is healthy, but on the other hand, it has very less nutrient

he was in the way so we got rid of him

You can ask me Enlish questions at any time
You should pay me $1 for asking a question at a time

at any time 在任何时候
at a time 一次
比如：（这种药片）一次一片-have a pill at a time
on the other hand 另一方面……（用于引出下文）
in the way 以这种方式
(在路上介词不同：on the way )

at any time任何时