Stepped construction
[化] 阶梯式结构
🧩 词语组成解析
v. 踏；行走（step的过去式和过去分词）
🗣️ 情景例句
How long have you known her?
你认识她多久了？
Those that make the best use of their time have none to spare.
能充分利用时间的人不会有时间多馀。
Last Sunday we had a picnic.
上星期天我们去效游。