VOA慢速英语:Lower Nicotine Cigarettes May Reduce Addiction

短语讲解：

1. Experts say nearly half of them will die of cancer.

die of （疾病、过度悲伤等） 死于; 强烈地感受到
例句：Nowadays many people die of cancer.
现在有很多人死于癌症。

2. That adds up to about 20 billion deaths worldwide so far this century.

add up to 总计达
例句：How much does that add up to?
那些加起来总共是多少？
so far 迄今为止; 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。

3. There are many studies which show that e-cigarettes, which deliver nicotine, don't actually help a lot of people break their addiction to tobacco or help people get off of cigarettes.

a lot of 诸多; 许多的
例句：Apart from the cost, it will take a lot of time.
除了费钱以外，还要花很多时间。

4. However, the U.S. Food and Drug Administration has yet to act on that law.

act on 对…起作用[有功效]; 奉行
例句：We can't act on your advice. Nevertheless, thank you for giving it.
我们不能照你的建议去办。不过承蒙您提出来,十分感谢。