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A lADDEr is lEAning AgAinst A wAll. ThE top oF ...

X-Y=3 X²=Y²+81 X=15

有个梯子靠在墙上。leaning against靠在…上

用from behind which, 这是一句定语从句,如果不用从句,就是两句并列句,the man is leaning against the door , a dog suddenly jumped out from behind the door. behind 不能省,因为狗不是从“门本身”跳出来的,而是从后面或里面出来的,它...

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