VOA慢速英语:The Long Search for a Malaria Vaccine

短语讲解：

1. Malaria control efforts currently depend on things like chemically treated bed nets and spraying against mosquitoes.

depend on依赖, 依靠
例句：All living things depend on the sun for their growth.
万物靠太阳生长。

2. So instead of picking out one or two or three genes, you have the potential for what we call breadth -- generating an immune response that would be broad rather than narrower.

instead of (用…)代替…, (是…)而不是…, (用…)而不用…
例句：We went to the Biology class instead of attending the English lesson.
我们去上生物课而不去上英语课。
pick out挑选, 选择; 选拔
例句：She was picked out from the whole class to represent them at the other school.
从全班中选出她来作为去另一学校的代表。

3. But no one knew either if the weakened sporozoites would activate the immune system to protect against malaria.

protect against保护, 保卫
例句：You need warm clothes to protect you against the cold.
你需要暖和的衣服来御寒。

4. It was injected into the skin, to simulate the bite of a mosquito.

inject into把…注入身体
例句：The doctor injected glucose into his patient's veins.
医生将葡萄糖注入病人的静脉。