像在其它行业一样，非法移民工人在美国迅速发展的住宅建筑业中发挥着重要作用。现在，凯西·瓦延斯要看一看，这些工人是如何成为（美国）生产力的一部分的。

注释：
1. booming adj.急速发展的

例句：Business is booming.
商业正在迅速发展。

2. phony adj.假冒的

例句：The phony glamour of night clubs soon became stale and boring.
夜总会那种虚荣的繁华不久便失去了新意而使人生厌。
3. collapse vi.崩溃, 瓦解

例句：The roof of the mine passage collapsed.
巷道的顶部塌了。
4. alternative adj.选择性的, 二中择一的

例句：We returned by the alternative road.
我们从另一条路回来的。
5. tacit adj.默许的

例句：The deal had the tacit approval of the President.
这笔交易得到总统的默许。

6. staunch vt.停止，止住

例句：They tried to staunch the flow of blood.
他们试图止血。
7. prevalence n.流行

例句：They were very surprised by the prevalence of antigovernment sentiments.
他们对普遍存在的反政府情绪感到很吃惊。

8. discrimination n.歧视

例句：There is no racial discrimination to be felt in this city.
在这个城市里感觉不到种族歧视。
9. unsanctioned adj.未认可(或批准)的
10. plea n.恳求, 请求, 辩解, 藉口


例句：She left the party on the plea of a headache.
她藉口头疼离开了晚会。

11. acquit vt.宣告无罪

例句：He was acquitted of a crime.
他被宣判无罪。

12. alien n.外侨，外国人
13. legitimize vt.宣布合法化

【积少成多】

1.Illegal immigrant workers play a key role in the booming U.S. home building business as they do in other industries.

play a role起作用，前面加上形容词表示起什么样的作用。

例句：The director played a role in writing the contract.
这长官在撰写合同中扮演了一个角色。

2.Without the illegal immigrants, “Jack” says, his business and that of most homebuilders would collapse.

Without虚拟语气

非真实条件句中的条件从句有时不表示出来，只暗含在短语或上下文中，这种句子叫做储蓄条件句。常见的有but,for ,without等引导的短语，以及or, or else, otherwise, but,were it not for 等后面的分句。

例：But for your help we couldn’t have succeeded in the experiment.
如果没有你的帮助，我们的实验室是不会成功的。

例：We could have done better under more favourable conditions.
在更有利的条件下，我们能够做得更好些。

3.Even when law enforcement does crack down, consequences are few.

crack down对...采取严厉措施,镇压

例句：The customs officers cracked down on smugglers.
海关人员制裁走私贩。

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