小下部分是水上部分的三倍.It's three times as big underwater.曲线及上坡道阻力大, 直线阻力小, 下坡道还有加速力.Curve and path resistance are great, linear resistance is little, declivous path still has quicken force....
The fridge door was open and food was scattered across the floor.冰箱门开着，食物散落在地板上。Keep what's left in a covered container in the fridge.把剩下的食物装入带盖的容器，放进冰箱。Defrost the fridge regularly so that it works at maximum effic...