✔ 最佳答案
凍檸啡少甜 = Iced coffee with lemon slices, slightly sweetened.
「少甜」不是 less sweet or less sugar. less sweet, less sugar 是走甜。
less 作為 preposition 是 remove from 的意思。
Put less sugar in the coffee. = 咖啡落少D糖。 (less as determiner)
Coffee less sugar, please. = 咖啡不要糖。 (less as preposition)