翼伞

This upward moving air will momentarily increase the wing's angle of attack possibly beyond the stall angle of attack.

在越过失速攻角时，上层流动的空气会暂时的增加伞翼的攻角。

Friction on the wing surface from air passage.

来自空气流过的伞翼表面的磨擦。

The angle of attack changes the aerodynamic balance of a wing.

攻角会改变一个伞翼的空气动力学平衡。

This occurs at one angle of attack for the same wing loading of a paraglider.

这种情形会发生於飞行伞的翼负载相当於攻角时。

Therefore, the lift ratios, proportional to that square of speed as we know, are respectively 4 for a paraglider, 2.25 for a hang-glider and only 1.7 for a sailplane.

在如上的例子中，左右翼尖的的速度差别对于滑翔伞是2，对悬挂滑翔机是1.5，对于固定翼是1.3。

To give you a simple idea, one can say for instance that a paraglider usually turns with a radius of 2 wingspans, where a hang-glider and sailplane turn respectively with a radius of 3 and 4 wingspan The speed ratio between the left and right wingtip is from the above example; 2 for a paraglider but only 1.5 for a hang-glider and 1.3 for a sailplane.

为了比较简单的说明，这里以实例进行说明：滑翔伞以2倍翼展的半径稳定盘旋，而悬挂滑翔机和固定翼滑翔机以3，4倍翼展进行稳定盘旋。

If you want to fly strong thermic conditions, you need to learn how your wing behaves after different degrees of collapses, big and small.

如果你想在强热气流条件下飞行，就要搞明白自己的伞翼在不同程度塌陷状况下的不同表现。

If you're using your speed bar or your trimmers are out and fast, be aware that you're new angle of attack generally _increases_ your risk of collapse or front tuck.

如果你正在使用脚蹬式加速棒或调速器加速飞行，要清楚你的伞翼正处于一个新的攻角下，通常会增加进入夹叶或前扣的危险。

According to Newton's law, all objects fall to Earth at a rate of acceleration of 9.8 meter per sec2 (32 ft/sec2), which in the case of our wing, is opposed or slowed down by the aerodynamic forces.

根据牛顿定理，所有的物体皆以每秒9.8米(32英0/秒)的加速度的比率下降到地球。而我们伞翼情况，则是被空气动力学的力量抵消或者减速。

It's better to avoid the stalls, spins and collapses in the first place by flying a heavier-loaded wing.

所以首先考虑的是，最好使用重负载伞翼来尽量避免失速、螺旋和折翼的发生。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。