Do they like a serious expression more than a smile?
他们喜欢微笑还是严肃的表情？
Neil: Do you have a Chinese expression like this Yang Li?
YangLi: 我们汉语里还真有一个相似的表达，不过我们说冰冻三尺非一日之寒。
Smile is a facial expression, has nothing to do with happiness.
笑只是个表情、与快乐无关。
In this expression, we do not need a multiplication sign or parenthesis.
这个表达式中，我们不需要乘号或括号。
To do so, you use a regular expression.
要进行这一验证，需要使用正则表达式。
There is a regular expression library or not to write unwanted expression is how do?
有了正则表达式库还是不会用，写不出想要的正则表达式怎么办？
There is a regular expression library or not to write unwanted expression is how do?
有了正则表达式库还是不会用，写不出想要的正则表达式怎么办？
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