Background impurity
[化] 本底杂质
🧩 词语组成解析
🗣️ 情景例句
The internet brings people closer from around the world.
因特网把世界上人们的距离拉近了。
Diseases come on horseback, but go away on foot.
病来如山倒，病去如抽丝。
Permission was granted and a policeman accompanied him to a pay phone.
警察同意了，陪他来到一个投币地电话前，