必要时

At a pinch it can be used as a weapon.

必可以把它当作武器。

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

应使病人保持温暖安，必可以镇止痛。

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

他奉命去检查船上所载货物并必扣留该项货物。

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.

低血压应该补液，必拟交感神经药（多巴胺或多巴酚丁胺）。