1. 釋義：something that helps you to progress towards achieving something
2. 理解："stepping stone"是可數名詞，字面意思“墊腳石”，引申意思“敲門磚”，“A是B的敲門磚”，"A is a stepping stone to B"。
a stepping stone to success
3. 應用
1）翻譯：好習慣是成功的墊腳石。
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.(微信在中國的流行奠定了它在世界范圍內成功的基礎）
