motion: n.1.运动,动,移动(opp. rest)。2.(天体的)运行；(车、船等的)动摇；(机器的)开动,运转；【机械工程】机械装置,机制。3.动作,举动；手势；眼色；姿态；〔pl.〕(个人或团体的)行动,举动,活动。4.(议会中的)提议,动议；动机,意向；刺激；【法律】申请,请求。5.大便；〔pl.〕排泄物。6.【音乐】(旋律、曲调的)变移。短语和例子M- itself is
mass: n.弥撒；弥撒的仪式[祷告、音乐]；弥撒曲。 a high [solemn] Mass (有烧香、奏乐等的)大弥撒。 a low [private] Mass (无烧香、奏乐的)小弥撒。 by the Mass 一定，的确。 say [read] Mass 作弥撒，念经。n.1.块，堆，团。2.群众，集团；〔the masses〕群众；民众。3.大量；大宗；众多；〔the
Convection is heat transfer by mass motion of a fluid such as air or water when the heated fluid is caused to move away from the source of heat , carrying energy with it 对流是传热集体议案的流体，如空气或水，当加热流体是造成搬离努力从源头上的热量，进行能量与它。
