单词	sales letter
释义	sales letter 推销函
随便看	knife edge pointer knife-edge pointer knife edge profile knife-edge pulse knife-edge refraction knife edge relay knife-edge relay knife edge relay contact knife-edge relay contact knife edge residual ridge knife edges knife-edges knife edge scanning knife-edge scanning knife-edge shaped needle knife-edge splittering knife edge support knife-edge support knife-edge surface viscosimeter knife edge suspension knife-edge suspension knife edge switch knife-edge switch Knife-edge technique for laser cooling knife edge test