这座桥非常牢固。
zhè zuò qiáo fēicháng láogù 。
This bridge is very firm.
他对这个计划的支持非常牢固。
tā duì zhègè jìhuá de zhīchí fēicháng láogù 。
His support for this plan is very secure.
确保家具的连接处牢固。
quèbǎo jiājù de liánjiē chǔ láogù 。
Ensure that the joints of the furniture are firm.