VOA慢速英语:Scientits Find new Substances to Fight Mosquitoes

短语讲解：

1. He says scientists tested more than a million chemical compounds until they found a substance called Ethyl pyruvate.

more than 不只是; 很; 超过; 在…次以上
例句：More than 1000 turned up.
最后共有1000多人出席。

2. "When we apply Ethyl pyruvate to a human arm and offer it to hungry mosquitoes in a cage, then very few of the mosquitoes are attracted to the human arm because only a few of them are able to smell it out," said Ray.

be able to 能，会; 能够
例句：You should be able to converse comfortably.
你应该能够舒服地进行谈话。

3. The scientists use these instruments to look for the signals that a mosquito's neurons send to its brain when it finds an interesting smell

look for 寻找（某人或某物）
例句：Look for honest, good-hearted people.
找那些诚实善良的员工。

4. He says DEET is too costly for most people who live in areas affected by malaria.

live in  住在（某地）
例句：I live in the south carolina.
我住在卡罗来纳州南部。