needs的解释，在云词典中needs是什么意思？

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needs

[ni:dz]
[现与 must 前后连用]必须, 一定, 务必

"Mother needs a holiday: the children do run her feet, you know."
"母亲需要休假。你是知道的，这些孩子们的确让她忙得不可开交了。"
"Their designs, for the most part, correspond to actual needs and regulations on environmental demand."
他们的设计绝大部分符合实际需要和有关环境要求的条例。
"What parents don't understand is that fat provides very valuable calories and that every cell needs fat and cholesterol to grow, " she said. "Cholesterol has gotten such bad press that we never see it in a good light, but it is essential for children, especially those under2."
"父母们所了不解的是，脂肪提供非常宝贵的热量，并且每个细胞都需要脂肪和胆固醇才能生长，"她说。"胆固醇的名声太坏，我们从来看不到它好的一面，但是它对孩童，尤其两岁以下的，极为重要。"
A Nazi doctrine holding that the geographic, economic, and political needs of Germany justified its invasion and seizure of other lands.
生存空间说一种法西斯学说，以地理、经济和政治的需要证明其侵略和掠夺别国是正确的
A circuit that needs to use an echo trap if the circuit is used alone.
一种电路，如果单独使用它，则需要使用回波抑制设备。
A crafty knave needs no broker.
狡猾的无赖不需要有中间人。
A soldier needs must go where duty calls.
职责所在，一个军人是必须要去的。
A stunt man needs to have a good guardian angel.
当特技替身演员的得有个守护天使来保佑。
A will needs the signature of the testator and two witness.
一份遗嘱需要立遗嘱人和两个证人的签字。
After I read the clause, I feel it needs some clarification.
读过这一条款之后，我觉得这条需要说明一下。