The power density and merit and demerit of ambient energy harvesters were discussed, and the relative advantages of the human energy harvesters compared with the ambient energy harvesters were listed.

讨论了环境能量集能器的功率密度及优缺点，并列出了人体能量集能器相对环境能量集能器的优势。

TV has its merit and demerit.

电视有长处也有短处.

What do you think about your merit and demerit?

你认为你有哪些优点、缺点？