Do you know what they are?

你知道他们是干什么的吗？

Because the equipment for adding sound to films had not yet been developed.

因为给电影配音的设备还没有研制出来。

Kate, I'm sorry about that argument.

凯特，那次争吵我很抱歉。

I'm quite able to pay for this suit.

这套衣服我是完全能够买得起的。

I've got some personal affairs that I have to see to, but I've also got some time to visit some relatives.

我还有些个人的事得去料理一下，但我也得抽些时间去看看一些亲戚。

New jobs are needed because a number of people are out of work.

因为许多人没有工作，所以需要为他们提供就业机会。