Identifiers cannot contain two consecutive underscores, nor can an identifier begin with an underscore followed immediately by an upper-case letter.
标识符不能包含两个连续的下划线，也不能以下划线开头后面紧跟一个大写字母。
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。
T is a capital letter, or upper case, and tis lower case.
是年夜写字母或叫年夜写字母盘；t是小写字母盘。
Case (upper vs lower) is often used to distinguish between species: generally, for mouse, rat and chicken, gene names are spelt with an upper case first letter and the rest in lower case;
大小写常用于区分不同物种：一般地，对于小鼠、大鼠和鸡，基因名称首字大写，其余小写；
Case (upper vs lower) is often used to distinguish between species: generally, for mouse, rat and chicken, gene names are spelt with an upper case first letter and the rest in lower case;
大小写常用于区分不同物种：一般地，对于小鼠、大鼠和鸡，基因名称首字大写，其余小写；
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