An integer literal, followed by a plus sign, followed by another integer literal.
一个整数文字，后面跟一个加号，再跟另一个整数文字。
An integer literal is a sequence of digits representing an integer constant.
整型字面值是一个代表整型常量的数字序列。
An integer literal is a sequence of digits representing an integer constant.
整型字面值是一个代表整型常量的数字序列。
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