láo
gù
1
firm
2
secure
这座城堡建筑得非常牢固
This castle is built very firmly.
基础必须牢固才能支持建筑物。
The foundation must be firm to support the building.
这种材料的连接非常牢固
The connection of this material is very secure.
孩子们在沙滩上筑起了一个牢固的城堡。
The children built a sturdy castle on the beach.
高墙和铁栏构成了一道牢固的防线。
High walls and iron bars form a solid defense line.
马桶座的安装必须非常牢固
The installation of the toilet seat must be very secure.
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