The message classes are used to retrieve messages generated by a previous operation such as a command call.

消息类用于检索前一个操作(比如一个命令调用)生成的消息。

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Methods To analyse the clinical materials of the 31 cases of patients with previous operation failure of lumbar disc herniation.

方法回顾分析我们收治的31例腰椎间盘突出症手术失败患者的临床资料。

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The understanding of the previous operation history in detail and correctly choosing of the first insertion position are the key for successful laparoscopic insertion.

详细了解既往手术史，正确选择第一穿刺部位，注意操作，是腹腔镜手术穿刺成功的关键。

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Ifremer, a French research institute which operates the Nautile, said it had signed a contract with the Spanish authorities to check the effectiveness of a previous operation to secure the wreck's leaking hull.

BBC: French sub to resume Prestige dives

The tactic itself was employed by the previous administration in a different operation.

WHITEHOUSE: Press Briefing

All the banks declined to comment beyond previous statements confirming their co-operation with regulators over the broader investigation.

CNN: Rate probe turns to four major banks