  The Guizhou Donkey Has Exhausted Its Tricks 黔驴技穷

  In ancient times there were no donkeys in Guizhou Province. Somebody brought a donkey from somewhere and tied it to a tree at the foot of a mountain. A tiger saw the donkey, and thought that it must be a fearsome monster. It hid behind a tree and spied on the donkey. When the donkey brayed, the tiger was frightened, thinking that the donkey was about to devour it. After a while, seeing that the donkey had not moved, the tiger approached it and teased it. The donkey became angry, and kicked the tiger. The tiger thought to itself: 'Is that all it is capable of?' It then jumped on the donkey and ate it. 
  从前，贵州没有驴子。有人从外地带回一头驴子，拴在山下。一只老虎看到了，以为是什么怪物，急忙躲到树林中去偷偷地瞧。驴子大叫一声，老虎吓了一跳，以为驴子要吃掉自己。时间一长，老虎觉得驴子并没有什么恶意，逐渐走近去戏弄它，触犯它。驴子生气了，用蹄子踢老虎。老虎心里想："你的本领不过就是如此啊！"于是立即扑过去，一口把它咬死吃掉了。

  This idiom is used to mean that one has exhausted one's skills.
  "黔驴技穷"这个成语比喻仅有的一点本事也用完了，再没有别的办法了。