| 兴奋剂 | xīng fèn jì | stimulant; doping (in athletics) | |
| 制剂 | zhì jì | (chemical or pharmaceutical) preparation | |
| 调剂HSK 6 | tiáo jì | to adjust; to balance; to make up a medical prescription | |
| 添加剂 | tiān jiā jì | additive; food additive | |
| 催化剂 | cuī huà jì | catalyst |
| 1 | This drink is sugar-free and additive-free, pure natural. | |
| 2 | The doctor recommends taking a vitamin D supplement during the winter months. | |
| 3 | Administering painkillers to him can relieve his pain. | |
| 4 | A painkiller was immediately injected into him after the ambulance arrived. | |
| 5 | Green tea is rich in antioxidants and helps protect the body's health. |