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
You are a walking dictionary.
你是活字典。
What day is it today?
今天星期几？
the strangest of them being perhaps the hovercraft.
其中最新奇的要数气垫船了。