垫脚石是一个汉语词汇，意思是供步行时踏脚的石头。
这只不过是通往那些更大更好事情的又一块垫脚石。
It is just another stepping stone to bigger and better things.
有时我们需要垫脚石。
如果这些学生想把学位作为进入中产阶级的垫脚石，那么他们需要在大学期间积累技能和知识。
These students need to build skills and knowledge during college if they are to use their degrees as a stepping-stone to middle-class mobility.
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