帮我翻译英语句子吧

.如果我能帮上什么忙，就告诉我。
Please tell me about it if I could help you with something,
Let me know about it if I am able to do something for you.
2.阿瑟已经三十多岁了，还没有开始自己的事业。
Arthur is now thirty years old but he has not yet started his career.
Arthur is aged thirty but he has not yet been occupied with any career of his own.

3.下一步把这个放在机器的这个位置。你们听明白了吗？
Place the machine at this location for the next step. Do you see?
Set the machine in place at this position. Do you understand what I have told you?
4.我认为五月的颐和园是最美的。
To my way of thinking, the Summer Palace is the most beautiful in
May.
I should say the Summer Palacein in May is the most beautiful.
The Summer Palacein in May, in my opinion, is the most beautiful of all.

5.我最后一次见到他是周五的晚上，当时他正趴在实验室的地上在找东西。
It was on Wedsneday evening that I saw him for the last time, when he was bending over to search for something on the lab f