单词	quadcopter
释义	quadcopter noun quad·​cop·​ter ˈkwäd-ˌkäp-tər  plural quadcopters : a drone (see drone entry 1 sense 3) deriving lift from four separate rotors each oriented about a vertical axis It's a quadcopter, meaning it's a miniature helicopter with four rotors; basically it looks like a giant four-leaf clover designed by Darth Vader. Lev Grossman A remote control quadcopter-type model helicopter flew directly through the U.S. Coast Guard base at the Arcata-Eureka Airport in McKinleyville on Saturday afternoon … Eureka Times Standard (California) Word History Etymology quad entry 5 + -copter (in helicopter entry 1) First Known Use 2004, in the meaning defined above
随便看	exequy exer exerce exercent exercisable exercise exercise bicycle exercise bike exercise in futility exercised exerciser exercisers exercises exercising exercitant exercitation exercitations exercitor exercitor maris exercitorial Exercycle exercycles exergonic exergual exergue

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