三种相位下的涡流场形态各有不同，上挥（下拍）初期前缘涡的运动主要存在两种形态。
The flow fields are different for the three phase motion patterns and there are two types of leading-edge vortex motion at an earlier stage of upstroke or downstroke.
我踏出家门，没有任何事情能阻挡我——深冬季节的暴风雪、我家门廊台阶上那永远挥散不去的雨水坑，还有这个季节带来的烂泥和污秽。
I step outside the house and nothing can stop me-the late season snowstorm, the puddle of standing water at the bottom of my porch steps that will never evaporate, the mud and muck this season brings.
他无比沉迷于此，只要一有机会，就会去球场挥上几杆。
Every chance he could get, he could be found on the golf course swinging away. It was an obsession.
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