Identifier completion - the editor automatically suggests identifiers such as member names after the ". "symbol.

标识符完成——编辑器会自动给出标识符建议，比如“。”符号之后的成员名称。

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Identifier — (a symbol that establishes the identity of the one bearing it).

identifier——(建立受体的身份的符号。)

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First, a symbol is an identifier preceded by a colon.

首先，symbol是前置有冒号的一个标识符。

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