②Since you have made up your mind, just go_ahead. We will stand up for you.

　　既然你已经下定了决心，那就放手干吧，我们会全力支持你的。

　　③The first part of the project was completed two months ahead_of_time/schedule.

　　第一期工程提前两个月完工。

　　2．(教材P30)Air pollution will get worse and this will be harmful to people, for example, it can cause cancer.

　　空气污染将加剧，这将对人们有害，例如，它可以引发癌症。

　　harmful adj.有害的

　　(1)be harmful to　　　　　　　　 对......有害

　　(2)harm n．&v. 损害，伤害

　　do sb.harm＝do harm to sb. 对某人有害

　　There is no harm in doing sth. 做某事无害处

　　(3)harmless adj. 无害的

　　be harmless to 对......无害的

　　①As we all know, smoking is harmful to our health.

　　众所周知，吸烟有害健康。

　　②Doctors always tell us that drinking too much is harmful (harm) to our health, but some people don't care.

　　＝Doctors always tell us that drinking too much does_harm_to_our_health,_but some people don't care.

　　医生总是告诉我们饮酒太多有害健康，但有些人却不在意。

　　③He may say no, but there is no harm in asking.

　　他可能拒绝，但问一问也无妨。

　　[语境串记]　This object gives off harmful gases, which may do harm to/be harmful to our health. You'd better make the object harmless before you use it.

　　这个物体发出有害的气体，这种气体有害于我们的健康。在你用之前最好让它变得对我们无害。

　　3．(教材P30)Noise pollution will also have an effect on the houses and schools near the airport.

　　噪音污染也会对机场附近的房屋及学校有影响。

　　have an effect on/upon 对......产生影响(＝have an influence on/upon)

　　put/bring sth. into effect　　　 实施，实行，使生效

　　come into effect/take effect (法律、规则或制度)生效；实施

in effect 实际上