stack.pop(); // 弹出无效元素
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，这一点在WPS官方版本下载中也有详细论述
This extends Google’s gatekeeping authority beyond its own marketplace into distribution channels where it has no legitimate operational role. Developers who choose not to use Google’s services should not be forced to register with, and submit to the judgement of, Google. Centralizing the registration of all applications worldwide also gives Google newfound powers to completely disable any app it wants to, for any reason, for the entire Android ecosystem.
await writer.write("Hello, World!");，这一点在Line官方版本下载中也有详细论述