When the aircraft achieves altitude, the skin expands and smooths as the crew compartment is pressurized.
当飞机达到一定高度时,由于乘员舱受到加压, 蒙皮会膨胀并变光滑。
英语百科
Cab (locomotive)
The cab, crew compartment or driver's compartment of a locomotive, or a self-propelled rail vehicle, is the part housing the train driver or engineer, the fireman or driver's assistant (secondman) (if any), and the controls necessary for the locomotive's, or self-propelled rail vehicle's, operation.