Because of this, we kept lookingback, wondering if we were leaving a trail of oil and petrol behind us.

　　What a relief it was when the boulders suddenly disappeared, giving way to a stretchof plain where the only obstacles were clumps of bushes. But there was worse tocome. J

　　10.Because of this, we kept looking back, wondering if we were leaving a trail of oiland petrol behind us.

　　因此，我们不时地掉过头，怀疑车后是否留下了机油和汽油的痕迹。

　　语言点1:句子结构分析:wondering if…是现在分词结构，作伴随状语，其中的if引导宾语从句，说明wondering的内容。

　　语言点2:keep looking back的意思是“不断地向后看”。

　　11.What a relief it was when the boulders suddenly disappeared, giving way to astretch of plain where the only obstacles were clumps of bushes.

　　突然大石块不见了，前面是一片平地，唯一的障碍只有一簇簇灌木丛。这使我们长长地松了口气。

　　语言点:give way to的意思是“给…让路”。

　　12.But there was worse to come.

　　但是更糟糕的事情在等着我们。

　　语言点:句子结构分析:worse指代“更糟糕的事情”。To come为动词不定式结构，充当worse的后置定语。