a long shot

• n. 很少机会成功的尝试

a long shot的用法和样例：

例句

1. Looking for her in the library was a long shot; I had no idea where she was.
   在图书馆中想找到她是不大可能成功的尝试，我不知道她在哪儿。
2. John was a long shot for mayor.
   约翰竞选市长，当选希望很小。
3. It's a long shot, but I should say she's about forty.
   这不好猜，但我猜她大约是四十岁左右。
4. It's a long shot but I think John must have stolen the bike.
   这只是一种猜测，但我认为一定是约翰偷了自行车。