He said styrofoam ballast kept the debris afloat as it crossed the open sea .
他说，这块残骸穿越海洋时，聚苯乙烯泡沫塑料的压舱物使它漂浮在了水面上。
These tiny birds weigh around a kilogram and are shot up in lieu of ballast or in empty nooks and crannies on full-blown satellite launch missions .
这些皮卫星重量仅仅只有一公斤左右，在压舱物中、空闲角落及繁忙的卫星发射任务间隙可以迅速发射。
This means that teams with kers have less ballast to move around the car and hence have less freedom to vary their car 's weight distribution .
这就是说使用kers的车队使用了更少的压舱物来移动赛车，因此有较少的自由来改变他们的车的重量分配。
At sea , meanwhile , on any day it is estimated that around 3000 species of aquatic animals and plants are being carried around the world in ballast .
然而据估计，海路上每天都有约3000种水生动物和植物混在船只的压舱物中周游世界。
Then the sound of rumbling thunder reached the watchers on the shore , as cargo , ballast , ammunition and 400 people went sliding and crashing down to the port side of the steeply listing ship .
