1. 释义：something that helps you to progress towards achieving something

2. 理解："stepping stone"是可数名词，字面意思“垫脚石”，引申意思“敲门砖”，“A是B的敲门砖”，"A is a stepping stone to B"。

a stepping stone to success

3. 应用

1）翻译：好习惯是成功的垫脚石。

Good habits are stepping stones to success.(Good habits is a stepping stone to success.)

2. 造句：

Wechat's popularity in China turned out to be a stepping stone to its success overseas.(微信在中国的流行奠定了它在世界范围内成功的基础）