A " house of cards" means a building of very weak structure.

“house of cards”指的是结构非常脆弱的建筑物。

They include limited political support, lack of money, weak organizational structures, and not enough consideration for the environment.

其中包括政治支持有限、资金匮乏、组织结构薄弱以及对环境考虑不足。

They were discussing this question, and were almost building up some weak structure of hope on his prolonged absence, when they heard him on the stairs.

当他们在楼梯上听到他的声音时，他们正在讨论这个问题，并且几乎对他长期不在的情况建立起一些微弱的希望。