Tetraprotic acid
[化] 四元酸
🧩 词语组成解析
🗣️ 情景例句
And ...?
而且……
The coach is always gloomy when the team loses a game.
球队一输球，教练总要绷起脸来。
'Hello, little girl,' she said.
“你好，小姑娘，”她说。