Phthoric acid
[化] 氢氟酸
🧩 词语组成解析
🗣️ 情景例句
Will it take long?
要很久吗？
Thank you for a wonderful meal.
谢谢你的美餐。
but that was precisely the idea adopted in some of the early instruments (seismometers) for recording earthquake waves.
但是早期记录地震波的仪器（测震仪）正是采用了这种思路。