The chemists tweak [twik] the formula to make a new substance that purports [pɝ`pɔrt] to be legal.
1. to make small changes to a machine, vehicle, or system in order to improve the way it works 對〔機器﹑汽車或系統〕作小小的改進
2. Matthew tweaked her nose . 馬修揑了她的鼻子。
3. purport to be/be purported to be -formal -to claim to be something, and give the impression that it is true, even if it is not 【正式】聲稱是…﹐據稱是…﹐像是…