买一送一”
"Buy one get one free""
英 [fri:] 美 [fri]
adj. 自由的; 免费的; 免税的; 任意的;
adv. 免费地; 自由地,无拘束地; 一帆风顺地;
vt. 免除; 释放; 使自由; 解救;
买一送一
[词典] buy one item with another similar item presented free; two for one; toofer;
[例句]出价,讨价,买入价和卖出价我在买一送一的特价时买了牙膏。
I bought toothpaste during a buy-one-get-one-free sale.