词汇	negative selection
释义	negative selection 图书剔旧
随便看	material to be packed material to be sieved material total material tower material trace Material tracing management material tracking material trademark material transfer material transfer between parallel conveyers material transfer conveyer material transfer machine material transfer recorder material transfer station material transfer to or between conveyers material transfer with conveyer material transformation material transformation theory material transition Material transittime material transmitting pressure only material transmitting traction only material transport material transportation Material Transportation Bureau