Stepping stone
01
踏脚石, 过河石
a stone in a marsh or shallow water that can be stepped on in crossing
02
垫脚石, 跳板
any means of advancement that helps one to make progress towards achieving something
例子
Learning basic coding was a stepping stone to more advanced programming skills.
学习基础编码是通往更高级编程技能的垫脚石。
