Stacking density
[化] 堆积密度
🧩 词语组成解析
[计] 叠卡
🗣️ 情景例句
But it is not polite to ask older people their age.
但问老人的年龄是不礼貌的。
I've got a terrible pain in my back.
我的背很痛。
Thank you very much.
非常感谢。