2.2.3 Mermaid 类图（classDiagram）
m.economictimes.com，这一点在谷歌浏览器【最新下载地址】中也有详细论述
Such a separation will make the business logic easier to comprehend (and also testable).，详情可参考51吃瓜
The employees have signed extensive confidentiality agreements – if they break them they can lose their jobs – and be thrown back into a life without income, often to the slums. Therefore we publish no names.
condition: typing.Callable[[T], bool],