测试的结果是置于所呼叫的 Check 方法里面，这里我很无聊地想要确认 1 + 1 是否等于 2。
The results that are to be tested are placed in calls to the method. Here I am unimaginatively confirming that 1 + 1 is 2.
在屋顶上，狙击手呼叫指挥官，“八号，确认，嫌犯已在我射程内。”
From the roof tops, a sniper calls in to his commander, “Number eight, affirmative. I’ve got him in sight.”
在RFC 3262中，开发了一项机制来确保可靠地发送消息，且仅为确认目的而发送，以便在使用udp之类的传输协议时不会丢失呼叫状态。
In RFC 3262, a mechanism was developed to ensure that the responses are sent reliably and acknowledged alone so that the status of the call is not lost if the transport protocol is something like UDP.
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