劝说无效时，他们就使用武力了。
劝说无效后，服务员告诉了驾驶员。
After no success convincing the woman to return, the flight attendant informs the pilot.
但问题是，一旦劝说无效，另外的大国就拒绝施加压力。
The trouble is that when persuasion has failed the other big powers have refused to apply pressure.
但问题是，一旦劝说无效，另外的大国就拒绝施加压力。
The trouble is that when persuasion has failed the other big powers have refused to apply pressure.
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