当孩子们的青春期普遍开始提前，人们不禁追问，哪些提前是正常变化的一部分，哪些才是真正的风险？
An airplane caught in turbulence moves both as a whole body and as a flexible structure, Pettit said: “It’s sort of mind-blowing, the number of ways an airplane can bend and twist.” To compensate for all that jouncing and twisting, the flight-control software uses the plane’s sensors to calculate the force and direction of the wind. Then it moves the flaps on the wings and tail to counteract the pressure. “Say the airplane is bending like a yardstick,” Pettit said. “The elevator”—the horizontal flap on the tail—“can move to oppose that. Or the rudder will stop it from moving side to side.” If the plane heaves up, the spoilers can press it back down. If it drops, the wing flaps can lift it up. If it starts to roll, the ailerons can right the ship.
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This story was originally featured on Fortune.com
Израиль ударил по зданиям сразу двух телеканалов разных странИзраиль ударил по зданиям ливанского телеканала и гостелерадиокомпании Ирана
10. Solidarity ·