Keystones
n. 重点( keystone的复数形式 ); 要旨; 基本原理; 拱心石
🗣️ 情景例句
And Michigan needs a touchdown. Michigan
Michigan队需要达阵得分。
If you have no hand, you cannot make a fist.
巧妇难为无米之炊。
Perhaps it is the desire for solitude or the chance of making an unexpected discovery that lures people down to the depths of the earth.
寻求独处的愿望或寻求意外发现的机会的欲望吸引人们来到地下深处。