Aeronautics (formerly) a contact created by the pilot to indicate that an plane's ignition is switched on and that the motor is ready for starting by swinging the propeller 接觸;觸摸;碰到 Never Permit that glue come into contact with your skin. 別讓那種膠水黏到你的皮膚上。 It is appropriate to clarify the medical/genetic status of https://biomolecula.ru/authors/35981