My experiences were teaching me to be able to do this too, if need be . 我的经验教导我，人们在必要时这样做一下也是可以的。
Use a fan or aseptic syringe to blow air into the cast to relieve itching, if necessary . 必要时可用扇子或清洁的注射器将空气送入管型内以减轻瘙痒。
Under the doctrine of flexible response we would still resort to all-out war if necessary . 按照灵活反应理论，我们在必要时，仍然要诉诸全力以赴的战争。
Replacement of the glass when necessary and some minor repairs would have rendered the building completely serviceable . 在必要时，更换玻璃并进行一些小修理，建筑物完全可以使用。
The flexibility of the printed catalogue was improved by leaving spaces or inserting extra pages when required . 留出空白或必要时插入另外的纸张可提高打印目录的灵活性（既便于修改）。
To this end, peace-keeping forces are authorized as necessary to use negotiation, persuasion, observation and face-finding . 为此目的，维待和平部队在必要时有权进行谈判、劝说、观察和调查。
Sam personally would spearhead the search for a prestigious, capable scientific director, though celia would help as needed . 萨姆将亲自出马，寻找一名有声望，有能力的所长，当然必要时西莉亚也将协助她。
The idea of fighting to protect ourselves where necessary and of concentrating at chosen points to destroy the enemy is difficult to express . 但在必要时，为保卫我们自己而战，并选择地点，集中力量，以消减敌人之此种战术思想，很难以言语说明。
He encouraged an informal arrangement that permitted even officers in sub-cabinet levels, or lower, to bypass their superiors and reach the president when they felt it necessary . 他鼓励非正式的传达意见，允许内阁大员以下或更低级的官员在必要时，越过上级直接将意见上达总统。
Mature people are willing to give in when necessary 成熟的人在必要时愿意让步。
