每天三分钟学英语第57期:英文"买二送一"怎么说?（打印版）

① a 10 percent discount

② a 20 percent discount

③ half off

④ up to 70% off

⑤ buy one get one free

⑥ buy one get one half off

⑦ buy two get one

⑧ buy three get one

⑨ 2 for 1