常规液体里分子之间的键合力相对较弱。The molecules in regular liquids are held together by relatively weak bonds.粘阻力等于合力.The viscous drags is equal to the resultant force.在这个和那个方向上的合力必定为零.The summations of forces in this and that direction...
空间站在重返地球大气层时会被烧毁。The station would burn up on re-entry into the earth's atmosphere.她又重返大银幕，扮演坎迪专横的母亲罗丝。She returns to the big screen to play Candy's overbearing mother, Rose.他重返教学岗位。He returned to school teachi...