更便宜更安全的热带寄生虫药片

短语讲解：

1. The World Health Organization says as many as 12 million people are infected with the leishmaniasis parasite.

infect with把…传染给…
例句：The man has been infected with cholera.
这人已染上了霍乱。

2. It's expensive, it has to be given as an injection, it's highly toxic to the kidneys, and it loses effectiveness if exposed to high temperatures.

expose to暴露于
例句：Don't expose it to the sun.
谨防日晒。

3. And finally, we're looking at a formulation that is very effective, but does not have that kidney toxicity.

look at评判; 审视; 看, 注视
例句：My work hasn't been looked at for a week.
我干了一个星期的工作也没人看一眼。

4. The drug is also used to treat fungal infections in people with compromised immune systems, such as HIV patients and organ transplant recipients.

be used to do被用来做……
例句：Zip codes are used to facilitate mail service. 
邮政编码方便了邮递服务。