Energy efficiency
能量系数，能量效率，能源效应
🧩 词语组成解析
🗣️ 情景例句
Oh! I just drop in on him for a chat.
哦，我只是顺便来和他聊聊天。
When the lights went out, I was washing my hair.
当熄灯的时候，我在洗头。
It's a pleasure. Bye.
不客气。再见。