VOA慢速英语:'Silent Spring' At 50; Confessions from English Learners; Janka Nabay Brings Bubu to Brook

短语讲解：

1. In the nineteen fifties, the United States Department of Agriculture was using more than two hundred fifty thousand  kilograms of pesticides a year.

more than 多于
例句：Rob likes apples more than bananas. 
罗勃对苹果比对香蕉还喜欢。 

2. And it led to a ban on the pesticide DDT in the United States.

lead to 导致
例句：Mass unemployment may lead to social upheaval. 
大批失业会导致社会动乱。 

3. The DDT ban in farming went into effect in nineteen seventy-two. 

go into effect 生效;被实施
例句："This Law shall go into effect as of February 1, 1986." 
本法自一九八六年二月一日起施行。 

4. Thanks to all of you who have contributed so far, including Adam from Taiwan.

so far 到目前为止
例句：It is merely a hypothesis; so far. 
到目前为止，这仅仅是一种假设。 

5. It can refer to either the temperature or the flavor.

refer to 提到
例句：Don't refer to this matter again, please.
请别再提这件事。

6. He advises listening to a song at least three times in a day so that the words stick in your mind.

at least 至少
例句：At least, I sincerely hope so. 
至少我是真诚地这样希望的。 
stick in 坚持
例句：Stick in, you'll succeed. 
坚持下去，你会成功的。