Some of them were as big as marbles. The man went to great lengths to prove that the diamonds were real. As we were walking past a shop, he held a diamond firmly against the window and made a deep impression in the glass.

　　7.Some of them were as big as marbles.

　　有的钻石像玻璃球那么大。

　　语言点:句子结构分析:as+adj.+as意为“像…一样…”，在句中充当比较状语。

　　8.The man went to great lengths to prove that the diamonds were real.

　　那人竭力想证明那钻石是真货。

　　语言点:句子结构分析:that引导的宾语从句说明prove的内容。

　　9.As we were walking past a shop, he held a diamond firmly against the window andmade a deep impression in the glass.

　　我们路过一家商店时，他将一颗钻石使劲地往橱窗上一按，在玻璃上留下一道深痕。

　　语言点:句子结构分析:as表示“当…时候”，引导时间状语从句，交代“边走边做的事情是…”。