词汇	To be depressed
释义	To be depressed. 垂头丧气的
随便看	particle microstructure particle migration Particle mixing particle mobility particle model particle modeling particle momentum particle monitor particle monitoring particle morphology particle morphology control particle motion particle motion trajectory particle moulding particle movement particle movement transformation particle moving particle multiplet particle multiplier particle/nuclear/theoretical physics particle number particle number concentration particle number conservation law particle-number conserving method particle number density