2 sentences

1. 地基打得很牢固，房子不会摇晃。

   dì​jī dǎ de hěn láo​gù, fáng​zi bù huì yáo​huàng.

   The foundation is very firm, so the house won't shake.

   Source: Dong Chinese Dictionary

2. 这个夹不太牢固，里面的纸张很容易掉出来。

   zhè​ge jiā bù tài láo​gù, lǐ​miàn de zhǐ​zhāng hěn róng​yì diào chū​lái.

   This clip isn't very secure; the papers inside fall out easily.

   Source: Dong Chinese Dictionary