Treadstone
n. 踏脚石（喻被人利用的计划、行动等）; 踏脚石 （语见电影<碟影重重>）
🗣️ 情景例句
There has been very little progress this term.
这学期没有什么进步。
How much is a call to the United states?
打一个电话到美国去需要多少钱？
I strongly recommend this product.
我强力推荐这种产品。