One of these is that it is very difficult to return to science after a career break to have a child-something Mr Summers also talked about in his speech.

其中一个就是，由于生孩子而造成职业中断一段时间后，再重返科学领域是非常困难的—这一点Mr Summers发言中也提到了。

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Operating capital, accounts of risk, and current liabilities being difficult to return lead to drying up of liquidity.

营运资金不足、账期风险、流动负债难以归还导致的流动性枯竭。

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In addition, expatriates may find it difficult to return to the U.S. on a regular basis.

WSJ: U.S.: Taxpayers Who Renounced Citizenship Fell Sharply

But once a user customizes IE, it's difficult to return it to a portal-less state.

CNN: The road to IE5 isn't without bumps

His serve is one of the most difficult to return in tennis.

WSJ: Who Can Upset Tennis's Untouchables?