Examples
zhè xiē这些xué sheng学生hěn很nǔ lì努力，dàn但xiào lǜ效率bú tài不太gāo高。
这些学生很努力，但效率不太高。
These students work hard, but their efficiency is not very high.
你们的效率太低了。
It is inefficient of you.
如何提高工作效率是我们现在要面临的难题。
The challenge we are going to face is how to increase work efficiency.