necessary
必备───necessary
I'll make the necessary arrangements.───我会做一些必要的安排。
If necessary I can come at once.───如果有必要，我可以马上来。
Military action may become necessary.───军事行动可能会成为必要。
Even if you can't eat like a health nut all the time, at least you'll get most of your necessary vitamins with the help of a supplement.───即使你不能像一个很注重养生的人一样时时都吃维生素，至少也用通过补充获取大部分必要的维生素。
Consequently, a third test was necessary to see if these abilities could have been learned.───因此，有必要再进行一项实验，观察这些能力能否通过后天学习取得。
Even after he had completely abjured violence he was honest enough to see that in war it is usually necessary to take sides.───即使在他发誓彻底放弃暴力后，他也诚实地明白在战争中经常必须要选择一方。
If God did not exist, it would be necessary to invent Him.
I will do so, if necessary.
To travel through the world it is necessary to have the mouth of hog, the legs of a stag, the eyes of a falcon, the ears of an ass, shoulders of a camel, and the face of an ape, and overplus, a satchel full of money and patience.
Make yourself necessary to someone.
You can slide the front seats forward if necessary.