压载物的拼音：Yā zǎi wù
give stability to (a ship) by putting a heavy substance in its bilge.
the vessel has been ballasted to give the necessary floating stability
form (the bed of a railroad line or road) with gravel or coarse stone.ballast
heavy material such as gravel sand iron or lead placed low in a vessel to improve its stability.
gravel or coarse stone used to form the bed of a railroad track or road.
a passive component used in an electric circuit to moderate changes in current.ballast
the film is an entertaining comedy with some serious ideas thrown in for ballast