这座桥的基础是否牢固,不能只看外观,还要做长期监测。Zhè zuò qiáo de jīchǔ shìfǒu láogù, bù néng zhǐ kàn wàiguān, hái yào zuò chángqī jiāncè.Whether the bridge's foundation is solid cannot be judged only by its appearance; long-term monitoring is also needed.
这把椅子做得很牢固,坐几十年也不会坏。Zhè bǎ yǐzi zuò de hěn láogù, zuò jǐshí nián yě bú huì huài.This chair is made very sturdily and won't break even after decades of use.
他们的友谊很牢固,从小学一直到现在。Tāmen de yǒuyì hěn láogù, cóng xiǎoxué yìzhí dào xiànzài.Their friendship is very solid, lasting from primary school until now.