Polyunsaturated acid
[机] 多不饱和酸
🧩 词语组成解析
[化]多未饱和的(指有一个以上的双键或三键有机化合物的, 还能溶解更多溶质的)
🗣️ 情景例句
Licking envelopes.
粘信封。
Childhood shows the man, as morning shows the day.
看人看年少，看天看破晓。
With the invention of writing, a great advance was made, for knowledge could then be not only communicated but also stored.
随着书写的发明，又迈进了一大步，因为这样一来，知识不仅能交流，而且能储存了。