必要时

At a pinch it can be used as a weapon.

必时可以把它当。

Should make the patient maintains lukewarm thaw quiet, can give when necessary tranquillizer and aconite.

应使病人保持温暖和安静，必时可给以镇静剂和止痛剂。

He was instructed to inspect the cargo on the ship and detain such cargo if necessary.

他奉命去检查船所载货物并于必时扣留该项货物。

As these patient are often hypoxemic and acidotic, respiratory alkalosis can be induced as a temporizing measure, until the drug of choice sodium bicarbonate (Class IIa) can be used.

低血压应该给于补液，必时给于拟交感神经药（多巴胺或多巴酚丁胺）。