throw-away character
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跟踪字符串提供了一种语言用于精确地选择出您希望的输出，废弃其他日志记录器消息。
Trace strings provide a language for selecting exactly the output you want, discarding other logger messages.
youdao
因为每次拼接字符串都会产生一个废弃的就字符串对象。
Occasionally, you need to build up strings from shorter strings, such as keystrokes or words from files.
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