慢速英语:Study: Head Lice Growing Resistant to Existing Treatments

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短语讲解：

1. The substance has been used for years in products to kill the insects.

be used for 用来做…
例句：It can be used for devising systems to protect against frost damage.
它可用来设计防止霜害的方法。

2. I was just scratching my head and one of the, the lice just came out.

come out 出来; 出现; 出版
例句：These new products will come out before long.
这些新产品不久将要上市销售。

3. They’re dried (up) and we like to point out that it’s like leaving a boiled egg in a hen-house -- it’s not gonna, it’s not gonna hatch.

point out 指明; 指出
例句：Please don' t take it amiss, if I point out your errors.
假如我指出你的错，请别见怪。