Fluorides
n. [无化] 氟化物, 氰化物（fluoride的复数形式）
🗣️ 情景例句
But personally I believe a business letter should end with Very truly yours, not Sincerely.
还行，乔治。但是我个人相信一封商业信函应该以“敬上”结尾，而不是“谨启”。
Thought is the seed of action.
思想是行动的种子。
and as the number of stars in the universe is so vast,
因为宇宙中恒星的数目极其庞大，