https://online2.tingclass.net/lesson/shi0529/10000/10271/3fz57.mp3
https://image.tingclass.net/statics/js/2012
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
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