step·ping-stone /ˈstɛpɪŋˌston/
踏腳石,方法,手段
Step·ping-stone n.
1. A stone to raise the feet above the surface of water or mud in walking.
2. Fig.: A means of progress or advancement.
These obstacles his genius had turned into stepping-stones. --Macaulay.
That men may rise on stepping-stones
Of their dead selves to higher things. --Tennyson.
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