當飛機向前移動(dòng)時(shí)，機翼上方的氣流產(chǎn)生向上的力使飛機飛離地面保持在空中不墜。
As the air craft moves forward, the air flowing over the wings produces lift to raise the aircraft off the ground, and keep it in the air.
我把椅子往前移了移，這樣會(huì )看得更清楚。
I set my chair forward to get a clearer view.
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