This flour mixture isn't wet enough to bind properly.
这浆糊不够湿，粘不牢固。
The foundation of the house is not secure.
这座房子的地基不牢固。
The foundations of the house are insecure.
这房屋的地基不牢固。
Their marriage has been on shaky ground.
他们的婚姻一直不牢固。
The leg of that chair is not very firm.
那条椅子腿很不牢固。
The house roof was (structurally) unsound.
这屋顶（结构）不牢固.
the bolts became loose over time; a loose chair leg; loose bricks.
时间一长毛边书散开了；不牢固的椅子腿；不牢固的砖。
The structure will prove weak in service.
该构件在使用中将被证明是不牢固的。
Their seat of reason is not a concrete.
他们的理智的基础并不牢固。
Not firm, solid, or securely in place; unstable.
不稳的不坚实，不牢固或不稳固地处于某一位置的；不稳的
Improperly meshed or worn gear wheels, gear wheel brackets broken or improperly secured.
齿轮啮合不好或破损，齿轮支架破裂或不牢固。
No students are able to pursue nuclear science without a solid grasp of mathematics .
不牢固掌握数学，学生们就不能研读核科学。
The table is going to collapse one of these days; the legs are very weak.
这桌子总有一天要垮下来；它的腿很不牢固。
but the house is strong.
不过屋子却挺牢固的。
The dam was too weak to withhold the pressure of the rising water.
水坝不够牢固,抵挡不住水上涨的压力。
knotted sheepshank
牢固缩绳结(缩绳不吃力时
Cement the permanent and unbreakable relationship with
巩固与..之间永恒的牢不可破的关系
The foundations were not strong enough to sustain the weight of the house.
这地基不够牢固，无法承受房屋的重量。