It has become a big problem recently.
最近它已经成为一个严重问题。
The air pollution has become a big problem.
有关污染，这是个全球性问题。
They never knew that population would become a big problem.
他们从没意识到人口会成为一个大问题。
They never knew that population would become a big problem.
他们从来都不知道人口问题将会成为一个大问题。
Nowadays, pollution has become a big problem for the world.
如今，污染已成为一个大问题。
In transnational merger and acquisition, culture has become a big problem.
在跨国并购中，文化成为最大的问题。
In transnational merger and acquisition, culture has become a big problem.
在跨国并购中，文化成为最大的问题。
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