When you cough, always block it with your hand or sleeve .

当你咳嗽时，要用手或着胳膊挡住。

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You can always use opaque glass if you need to block a street view.

如果你需要挡住外面的街景，你随时可以使用不透明玻璃。

《柯林斯英汉双解大词典》

In short, the moral to this story is to always convince yourself that the invariants inside a code block ensure that any casts in the block will always succeed.

简言之，这些方法的本质总是使您确信代码块内部的不变量会确保代码块中的任何类型强制转换都将成功。

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If this approach fails, you can always just block the offending type of communication.

WSJ: Ground Rules for Digital Communication With Friends and Family

Until now, the left and right have always joined forces to block big changes to the strict labour code.

ECONOMIST: Economic and social reforms remain incomplete

Over the years, there have been repeated rumors about Amazon.com making an offer for the company, but the stumbling block analysts always have raised is that the many locations that distribute DVDs for Netflix would force Amazon to assess sales taxes on customers in states where they previously had no physical presence.

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