1. | 聚对苯二甲酸乙二醇酯（全写为 polyethylene terephthalate，可做食品饮料包装材料）the abbreviation forpolyethylene terephthalate (an artificial substance used to make materials for packaging food, including plastic drinks bottles) |
2. | 正电子发射断层扫描（全写为 positron emission tomography，大脑或其他体内部位的成像）the abbreviation forpositron emission tomography (a process that produces an image of your brain or of another part inside your body) |
a PET scan 正电子发射断层扫描 |
3. | 中级英语证书考试（全写为 Preliminary English Test，由英国剑桥大学命题，测试英语作为外语的口语和写作能力是否达到中级水平）the abbreviation forPreliminary English Test (a British test, set by the University of Cambridge, that measures a person's ability to speak and write English as a foreign language at an intermediate level) |
