advancing blade

基本解釋

At 300kph, the air passing over the advancing blade could reach 1,100kph while that over the retreating blade would be about 500kph.
速度為300kph時，通過前面漿片的空氣速度可達1100kph，而尾部漿片上的速度大約500kph。
But when flying forward the air passing over the blade that is advancing to the front of the helicopter (and so into oncoming air) provides more lift than the one that is retreating to the back.
但是當向前飛行時，它的旋翼將轉(zhuǎn)向直升飛機的前方（如此一來，就變成朝向迎面而來的空氣），經(jīng)過葉片上方的氣流將比經(jīng)過葉片背面的氣流產(chǎn)生更大的升力。