unstable soil

Cottage Areas consist of mainly single-storey structures built of stone or less-permanent materials on hillsides.

平房区内的房挝垃主要是沿山兴建、以石块或其他不太坚固的材料建成的单层搭建物。

The dam was not strong enough to hold back the flood waters.

水坝不太坚固, 挡不住洪水.

The dam is not strong enough to hold back the flood waters.

水坝不太坚固，挡不住洪水。

Even less pressing concerns like Spanish and Milanese expansion will soon become a royal headache for the monarchy if France does not establish solid fronts to the south.

而如果不建立起坚固的防御，本不用太担心的西班牙和米兰的扩张便会成为国王的心病。

DARBY: But *we* ought, we that are strong, to bear the infirmities of the weak, and not to please ourselves.

我们坚固的人应该担代不坚固人的软弱，不求自己的喜悦。

The quality or state of being pertinacious.

坚持到底，执拗，顽固坚持不变的特性或状态

The dam is too weak to withhold the pressure of the rising water .

水坝不够坚固，抵挡不住水上涨的压力。

of definite shape and volume; firm; neither liquid nor gaseous.

固定的形状和体积；坚固的；不是液体或气体的。

We will train our hearts and bodies for a firm unshaken spirit .

我们要磨练身心，养成坚固不拔的精神。

Sound love is not soon forgotten.

坚固的爱情不会顷刻忘怀。

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

Refusing to give up or let go;persevering obstinately.

坚持不懈的，执意的拒绝放弃或听任的；顽固坚持的

To be obstinately repetitious, insistent, or tenacious.

坚持不变倔强地重复、坚持或固执

brassbound traditions; brassbound party loyalists; an ironclad rule.

顽固的传统；坚定的政党拥护者；不可改变的规章。

an impregnable fortress; fortifications that made the frontier inviolable.

一个坚固的城堡；防御工事使得边境不可侵犯。

Structural strength, however, is not the primary concern,

结构是否坚固已经不是首先考虑的问题了，

A man's character is like a fence-- it cannot be strengthened by whitewashing.

人的品行犹如一道篱笆——粉饰并不能使之坚固。

stubbornly insistent on theory without regard for practicality or suitability.

顽固的坚持理论而不管实用性或者合适性。