这个圆筒的体积有多少?What's the volume of this cylinder?通常平动和转动同时发生, 例如,圆筒的滚动.Often translation and rotation occur simultaneously, as in the case of a rolling drum.空气的分子会撞击圆筒的整个筒壁和上下两端.The molecules of air would bombard all s...
Dorothy, come on. Never mind your shoes. They'll soon dry off.快点儿吧，多萝西。别去管你的鞋子了，它们很快就会干的。I'm speaking from outside the Dorothy Chandler Pavilion, in Los Angeles.我正在洛杉矶,DorothyChandlerPavilion的外面为您解说.Dorothy...
Sailing boats lay at anchor in the narrow waterway.帆船停泊在狭窄的水道上。There was swimming and sailing down on the lake.有人在湖上游泳和扬帆。Pregnancy wasn't all plain sailing and once again there were problems.孕期并非一帆风顺，这不，又出现问题了。...