According to a survey, students' safety has become a big problem.

根据一项调查，学生的安全已经成为一个重大问题。

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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。

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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。

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If we don't open the banks on Monday there will be a public uprising because getting cash will become a big problem.

BBC: How the Cyprus crisis affects Cypriots

People worry he's become a big problem for us.

WSJ: Afghan Politicians Urge U.S. Patience

"If there appears to be a tie, then faithless electors become a big problem, and we could have a real mess on our hands, " said Robert W. Bennett, a constitutional law professor at Northwestern University who has written extensively about the Electoral College.

CNN: Electoral College tie possible in Obama-Romney race