Applied with inverted power, the long axle drives the powerarm and the long lever to fallback, accordingly the bed surface returns to the normal position.
施以反向动力，长轴带动动力臂和长杆回落，则床面回复原位。
2
She had to concentrate on flexing her pectoral muscle, or the triceps, to power the arm.
为了给手臂提供力量，她不得不用力伸缩她的胸肌或者三头肌。
3
These cells then power the motors located here under each arm.