Sally is looking at a big ship.为什么要用at?

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Sally is looking at a big ship.为什么要用at?
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Sally is looking at a big ship.为什么要用at?
Sally is looking at a big ship.为什么要用at?

Sally is looking at a big ship.为什么要用at?
is是be动词 在这里的实意动词是look而不是is 因此,is在这里不翻译,只是跟looking构成正在进行时时态结构,翻译为“正在看”.
而at在这里是介词,介词属于虚词,没有实际意义,look是不及物动词,要和介词连用.所以这里的at是跟look这个动词搭配一起翻译为“看”
因此,这句话该翻译为：Sally正在看一艘大船.

looking at中at指的是一个特定的地点或事物，ship船是个特定的事物，所以用at

这应该是固定搭配吧，look at是看着某物的意思

look at是词组

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