内燃机发出轰鸣声, 列车员跳上车厢, 火车开走了.The diesels roared, the conductors jumped aboard, and off the train went.工程师在设法制造一种在商业上切实可行的发动机来取代内燃机.Engineers are still trying to come up with a commercially viable replacement for internal - c...
...bubble baths, soaps and shampoos.泡泡浴、肥皂和香波Results With both methods , two pet shampoos had excellent efficacy fleas.结果灭蚤香波洗剂对猫栉首蚤均具有良好的杀灭效果.Wavy hair profits most from shine - shampoos and conditioners.波浪般的头发则适合柔亮型洗发乳...
在撞击过程中, 动量的变化是突然的,但非瞬时的.In a crash, momentum changes abruptly but not instantaneously.有时,在局部速度中可能出现瞬时脉动.Sometimes temporal fluctuation may take place inthe local velocity.它表示寻常光波前和非常光波前的瞬时轨迹.It represents the instantaneo...