Thus the difficulties of discontinuous velocity gradient and the stress singularity at the exit point are avoided, and the expense of computation is reduced.

这样回避了速度梯度间断的困难，缓和了出口处应力奇性引起的矛盾，同时又减少了计算量。

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But later on, people found that the actual doers were Japanese housewives, thus adding the difficulties to stop them from conducting Carry Trade.

但是，后来人们发现，实际上是大量的日本家庭主妇在做这件事情，而要想制止家庭主妇做套利交易，难度非常大。

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Thus, catching the opportunities and trying our best to cope with the difficulties is necessary for us to succeed in the 21st century.

因此，抓住机遇并竭尽全力去对付困难对于我们在21世纪的成功是必不可少的。

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