When two or more things are contrasting, they are different from each other in a way you notice — often a way that looks interesting or attractive. A black frame on a white wall; a quiet person next to a loud one; sweet and salty in the same dish.

When two or more things are contrasting當兩個以上的東西形成對比時 in a way you notice用你會注意到的方式 they are different from each other彼此不同 often a way that looks interesting or attractive通常還是看起來有趣或吸引人的方式。 on a white wall白牆上的 a black frame黑色相框；next to a loud one吵鬧的人旁邊 a quiet person安靜的人；in the same dish同一道菜裡 sweet and salty甜的和鹹的。

Teachers, writers, and people who care about clothes or design use this word a lot.

Teachers, writers, and people who care about clothes or design老師、作家，還有在乎服裝或設計的人 use this word a lot很常用這個字。

It comes from the verb contrast. You can also meet contrasting as the ordinary -ing form of that verb (they are contrasting the two photos), but as an adjective it means set apart by a clear difference.

It comes from它來自 the verb contrast動詞 contrast（對比）。 You can also meet contrasting as the ordinary -ing form of that verb你也會看到 contrasting 當作那個動詞普通的 -ing 形式 (they are contrasting the two photos)（他們正在對比這兩張照片） but as an adjective但作為形容詞時 it means set apart by a clear difference意思是因為明顯的差異而被區分開來。

Neutral, not slang, not especially formal. Though actually the difference should be one you can feel or see; it is more than just “not the same on paper.”

Neutral中性， not slang不是俚語， not especially formal也不算特別正式。 Though actually不過其實 the difference should be one you can feel or see這種不同應該是你感覺得到或看得到的；it is more than just而不只是 "not the same on paper."「紙上看起來不一樣」而已。