短语讲解：

1. It would also increase the number of foreign temporary technology workers at a time when American technology workers face high unemployment.

at a time 依次， 逐一， 每次
例句：Chew a half stick of gum at a time.
一次只嚼半片口香糖。

2. He called on Congress to approve the bill.

call on 拜访（某人）；叫；号召；要求
例句：We call on interested parties to meet in september.
我们呼吁相关各方于9月份召开会议。

3. The studies did not ask about a disputed part of the bill that would increase the number of temporary foreign technology workers.

ask about 询问，打听；打探
例句：You here to ask about my love life?
你们是来问我感情生活的?

4. The alliance is made up of Latino American business people.

be made up of 由…组成
例句：The loan will be made up of two portions.
贷款由两部分组成。
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