VOA慢速英语:Spray Shows Promise in Malaria Study in Benin

短语讲解：

1. This has been happening with current mosquito killers, including chemicals known as pyrethroids.

known as被认为是，被称为
例句：Radio, television, newspapers and magazines are known as the mass media.
广播、电视、报纸和杂志被称为大众传媒。

2. When we think about a large-scale goal to take on malaria, it’s not an either/or situation.

think about考虑…; 捉摸…
例句：Elinor is thinking about emigrating to the United States.
埃莉诺正在考虑移居美国。
take on开始做，开始执行，开始处理；承担(责任等)；担任(工作); 采用，采纳，采取
例句：He took on new ways of life after he got married.
他婚后开始了新的生活方式。

3. We’re going to have to throw multiple things out there in order to see what the optimal combination is to achieve control.

throw out拒绝; 否决; 提出(暗示、建议等)
例句：The suggestion was made at the conference, but they threw it out.
这个建议在会上提出来了, 但他们不予考虑。
in order to为了…
例句：We started early in order to arrive before dark.
为了在天黑前到达,我们很早就动身了。

4. Bendiocarb is widely used against a number of different insects.

a number of一些
例句：A number of new products have been successfully trial-produced.
许多新产品已试制成功。