Peppering
vt. 在…上撒胡椒粉（pepper的现在分词形式）
🗣️ 情景例句
It's interesting.
很有趣。
There is no royal road to learning.
治学无坦途。
below 20 per cent, its bactericidal action is negligible.
浓度低于20％时，杀菌能力基本上就不存在了。