Mixed case is the easiest to read, although all lower case is also easy.

大小写混合更有利于阅读，全小写也具有同样的可读性。

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In case of emergency push the lower button to stop the train.

按下按钮后列车即停车。除紧急时以外请勿使用。

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Additionally, all the lower case letters in the string must be converted to upper case.

此外，小写字母应该转化为大写字母。

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Additionally, all the lower case letters in the string must be converted to upper case.

此外，小写字母应该转化为大写字母。

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