Hardnesses
(hardness 的复数) n. 坚硬, 困难, 严厉, 勇气\\n[化] 硬度
🗣️ 情景例句
Birds are good pets, they can wake you up by singing in the morning.
鸟是很好的宠物，它们早上的歌声可以将你从梦中唤醒。
To negotiate the agreement
商议同意
Yes, I have.
是的，我刚去过。