You must be thoroughly familiar with what is normal before you can discern the deviations that would be termed abnormal.

您必须完全熟悉什么是正常的，然后才可以看出偏差将被称为异常。

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It is obviously crucial for the physician to be thoroughly familiar with the pharmacological properties of drug before it is administered.

医师用药前全面地熟悉药物的药理作用显然是非常重要的。

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Personnel must be thoroughly familiar with properties and safety considerations before being allowed to handle oxygen and its associated equipment.

在被允许使用氧和它的附件之前，操作人员必须对它们的性质和安全问题十分熟悉。

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To develop a good long-term strategy for marketing food products, he must be thoroughly familiar with the strategies of giants such as Marks and Spencer.

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