🧩 词语组成解析
abbr. 炼油工程师（Petroleum Refining Engineer）
n. 多塞特（人名）；多尔塞特棉粗平布
🗣️ 情景例句
It's extremely good of you to do this for me.
你帮我做了这件事，真是太好了。
How long will it take you to have it fixed?
你要多少天才能把它修理好？
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。