n.[C]

1. 陷阱；圈套
   There are many pitfalls for teenagers today.

   对现今的青少年来说，到处有许多陷阱。

2. 隐藏的危险；易犯的错误；意想不到的困难
   The road to the conquest of cancer is long and full of pitfalls.

   战胜癌症的征途是漫长的，而且布满意想不到的困难。

n.

1. a hidden or unsuspected danger or difficulty.
2. a covered pit for use as a trap.