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）
网友评论