短语讲解：

1. The area is also called the “meningitis belt” because of high levels of the disease meningitis that exist there.

because of 因为，由于
例句：The journey was slow because of continual stops.
由于常常停下来，所以行程很慢。

2. We were able to show … that the dust [increases the chances] of the bacteria moving from the mouth, nose or throat [to] the sites where they causes severe infection.

be able to 能够
例句：He will be able to take up his normal routine shortly.
他不久就能处理日常事务。
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