as做介词,necessary做名词么?Zoos are sometimes seen as necessary but not poor alternatives to a natural environment. Discuss some of the arguments for and/or against keeping animals in zoos.
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as做介词,necessary做名词么?Zoos are sometimes seen as necessary but not poor alternatives to a natural environment. Discuss some of the arguments for and/or against keeping animals in zoos.
as做介词,necessary做名词么?
Zoos are sometimes seen as necessary but not poor alternatives to a natural environment. Discuss some of the arguments for and/or against keeping animals in zoos.
as做介词,necessary做名词么?Zoos are sometimes seen as necessary but not poor alternatives to a natural environment. Discuss some of the arguments for and/or against keeping animals in zoos.
楼上这位分析得不对,necessary 绝对是形容词,名词是necessaries.这里的句子结构是这样的：（Zoos） （are sometimes seen） as （necessary but not poor alternatives） to a natural environment.
as是介词没错,但它是修饰后面alternatives （替代品）的,necessary but not poor（必要而又不廉价的）是一个整体作alternatives的定语.necessary和 as 两者并没有直接联系.
能，necessary当名词讲的意思是“必需品”。
动物园有时被视为必须的，但又不能成为自然环境的一个替代品。讨论关于是否该将动物养在动物园的问题。