The group of similar words 残暴, 残酷 and 残忍 are often seen in free Chinese lesson but difficult to tell apart because all of them mean cruel. Firstly, 残暴 can be used to describe people’s temperament and also the specific actions of destroying, suppressing and plundering like 行为残暴. When you study Chinese in free Chinese lesson, you should know 残酷 means brutal, which can describe both the bad living conditions and the specific cruel actions such as 残酷无情. When we use 残忍, we usually say the means of doing things are merciless. We often say 手段残忍.

During the process when you learn Chinese online free, you may often see the words 测量, 测试and  测验. When we 测量something, we usually need the help of instruments and the objects are mostly physical quantity if things like 测量风速. 测试carries the meaning of test. It emphasizes to examine and test the conditions of certain things. Students who lean in free Chinese lesson often hear 测试水平. 测验is very similar with 测试. But it needs certain standards or methods to o testing. We can say 测验对光的敏感度.