中英成语俚语800对025：冰冻三尺，非一日之寒

　　冰冻三尺，非一日之寒

　　Ill habits gather by unseen degrees.

　　The tree falls not at the first stroke.

　　An oak is not felled at one stroke.

　　eg：Smoking caused the man lung cancer as ill habits gather by unseen degrees.