不稳固

• built on the sand

例句

1. 那婚姻一开始就不稳固。
   The marriage got off to a rocky start.
2. 他的公司根基不稳固。
   His company was built on the sand.
3. 他们的婚姻一开始就有些不稳固。
   Their marriage got off to rather a shaky start.