Firming
vt.& vi. 使坚固（firm的现在分词形式）
🗣️ 情景例句
once you get to know them.
一旦认识了周围的人以后。
Her blouse is behind the desk.
她的上衣在书桌后面。
Speculations about is nature have been going on for literally thousands of years,
人们对睡眠作用的种种猜测，确实有数千年之久。