短语讲解：

1.  A specialist in the UNESCO endangered language program says, by the end of the century, more than half of Africa's languages will be gone.

by the end of 到…为止
例句：Will that be resolved by the end of 2010?
这个问题能否在2010年底前得到解决？

2. But she says a language at least needs people who can speak it as their second language.

at least 至少
例句：Read at least 30 books.
至少读30本书。

3. If they are tiny, she says , a language is extinct. She says languages can die as a result of an increasingly globalized world.

as a result of 由于…的结果
例句：As a result of the write-downs, regulators have achieved one objective.
由于资产减记，调控者已经达到一个目标。

4. As a linguist, we have to be very worried about it.

worry about 担忧
例句：Do you worry about your weight?
你担心自己的体重吗？


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