The Ethernet port has a little metal flap that drops down when the cable is plugged in.
FORBES: Ultrabooks: Parade Of Beauties At The Consumer Electronics Show
The blades are vibrated from side to side, as well as up and down (edge fatigue and flap fatigue) for millions of cycles, simulating twenty years of activity in the real world.
FORBES: Connect
In particular, a few readers complained that the new keyboard no longer has a flap underneath it to make the keyboard tilt down and away from you.
CNN: Tips and taps to relieve your carpal tunnel and repetitive stress syndrome
On one side are the people who believe that the first proto-birds climbed into trees and that, as they glided down, they figured out how to flap.
ECONOMIST: Birds that don't fly may be using their wings to run uphill
应用推荐
模块上移
模块下移
不移动