Most variables and functions should start with a lower case letter.
大多数变量和函数应以小写字母开头。
Z Trace this letter first, then color the matchable upper and lower case letters.
首先按线描好字母，然后将匹配的字母大小写的框内区域图成相同颜色。
Maybe you typed a capital letter where you should have typed a lower case letter.
也许您把应该小写的字母打成大写了。
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