This saves you the trouble of having to re-type the regular expression every time.
这样您就不必每次都要重新键入正则表达式。
Welcome to English in a minute. If you smell smoke, you know there is fire. Should we call the fire department every time we hear this expression?
欢迎来到一分钟英语。如果你闻到烟味，意味着那有火。当我们每次听到这个表达都要打电话给火警吗？
The construction can get a peculiar expression under each condition every angle, time and distance.
这样的结构使建筑在不同的条件下（不同的角度，时间和距离），都会表现出不同的样子。
Should we call the fire department every time we hear this expression?
当我们每次听到这个表达都要打电话给火警吗？
Should we call the fire department every time we hear this expression?
当我们每次听到这个表达都要打电话给火警吗？
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