I've run out of steam.

我已经失去动力了。

Poor supervision, bad job prospects or lack of money cause them to run out of steam.

缺少职业指导，前途渺茫，经济拮据成了他们最终放弃的原因。

Other times they simply run out of steam trying to get somewhere, but getting nowhere.

另一些时候，他们只是没有到达目标的力气而迷失方向。

Other times they simply run out of steam trying to get somewhere, but getting nowhere.

另一些时候，他们只是没有到达目标的气力而迷失方向。

George: : I've run out of steam. To be honest, I want to be in a different environment.

乔治：我已经筋疲力尽了。说实在话，我想换个环境。