stable、firm、solid的区别

用简练汉语区别这样的词汇有时不太容易,建议在英文的句子中加以分别,例如：
1.They were glad to leave the boat and put their feet on the solid ground.
2.Parents must be firm with their children.
3.We must maintain a firm attitude.
4.This ladder isn't very stable.
多读几遍,区别自然出来了