An empty subjects.yml file is created by Rails when it generates the corresponding subject unit test.

在Rails生成对应的单元测试时，它会创建一个空的subjects . yml。

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Additionally, Notes prompts you to confirm whether or not a message should be sent with an empty subject.

此外，在主题为空时，Notes会提示确认是否发送该消息。

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We actually saw this before in our Subject trait, where the Subject.observers field was initialized to an empty list.

我们实际上在前面的Subject trait中见过，Subject . observers字段被初始化为一个空列表。

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The programmes are strangely ponderous, and strangely prone to long pans over empty theatres, given that they deal with such a dazzling subject.

ECONOMIST: Travelling through life first class

The council said proposals for the building, which has been empty for about five years, are still being finalised and will be subject to planning consent.

BBC: Grimsbury 'eyesore' building revamp planned