n.陷阱；隐患；想不到的困难
The wolf was caught in a pitfall. 那只狼是利用陷阱捉到的。
There are many pitfalls for teenagers today. 对现今的青少年来说,到处有许多陷阱。
Life is full of snares and pitfalls and no one is proof against them all. 生活充满了诱惑和风险,没有人能挡得住的。
The road to the conquest of cancer is long and full of pitfall. 战胜癌症的征途是漫长的，而且布满意想不到的困难。
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