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adj.
必要的，必需的[（+for/to）] Oxygen is necessary for life. 氧氣是生命所必需的。 It is necessary that he be sent there at once. 有必要馬上派他到那裡去。 n.
必要的物品；必需品[P1] She has enough money to obtain the necessaries of life. 她有足夠的錢購買生活必需品。
adj.
必要的; 必需的 if necessary 如果必要的話 it is necessary for (sb./sth.) to do sth. 某人／某物必須做某事 npl.
生活必需品
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ph.
不可避免的災難, 非忍受不可的災難 The loss of jobs is regarded by some as a necessary evil in the fight against inflation. 有些人認為要遏止通貨膨脹就難免有人得失業。
ph.
如果必要的話 You can use these reference books, if necessary. 如果必要, 你可用這些參考書。
