压舱石

压舱石	yā cāng shí	ballast stone; (fig.) source of stability
压	yā	to press / to push down / to keep under (control) / pressure
压	yà	used in 压根儿 / used in 压马路 / used in 压板
舱	cāng	cabin / the hold of a ship or airplane
石	Shí	surname Shi / abbr. for Shijiazhuang 石家庄, the capital of Hebei
石	dàn	dry measure for grain equal to ten dou 斗; one hundred liters / ancient pr. [shi2]
石	shí	rock / stone / stone inscription / one of the eight categories of ancient musical instruments 八音