1N-UNCOUNT 流沙Quicksand is deep, wet sand that you sink into if you try to walk on it. 流沙
The sandbank was uncertain, like quicksand under his feet.
那个沙坝并不稳固,他脚下如同踩着流沙一般。
2N-UNCOUNT 难以摆脱的困境;不可靠的局面 You can refer to a situation as quicksand when you want to suggest that it is dangerous or difficult to escape from, or does not provide a strong basis for what you are doing. 难以摆脱的困境;不可靠的局面