上部击球是击在球中心以上的抽球，从而使球向前旋转，这种手法常用在高尔夫或网球中。
A stroke that lands above the center of a ball, as in golf or tennis, giving it a forward spin.
但是与飞机不同的地方在于，当直升机向前飞行时，空气是以不同的速度流过旋转的叶片的。
But unlike an aircraft, when a helicopter is flying forwards the air passing over its rotor blades does so at different speeds.
这条半径随着车轮的向前移动在旋转着。
And, that radius rotates around the wheel as the wheel is moving forward.
因此在向前飞行时，旋转叶片可以在每一边产生相同大小的升力来进行机身的平衡。
So in forward flight each rotor can produce an equal amount of lift on each side, thus providing balance.
吸气时旋转左臂向前。
这样做会让手臂受力不均但是当旋转腿向前幅度会更大。
The forces down the arms become uneven when this is done but provides for a larger motion when swinging the leg forward.
步行带动腰椎向前弯曲并随左右下肢运动而旋转、侧弯，其主要作用力来自腰大肌。
Walking brought along the lumbar vertebra to bend forward and rotate with the movement of right and left lower limbs. The main force to finish this movement came mainly from musculus psoas major.
她的拍子现在降到了最低点，她将带动拍子向前向上，从下方击打球并且加上旋转，完成它。
She's dropped her racquet almost to its lowest point and she'll bring it forward and up, hitting the ball from below and swinging up and through it.
旋转肩膀向前作圆周运动。
而且这种起重机能实现360度旋转，这意味着它能向前、后、左、右各方位十几米处自行抓起并旋转起吊物，而不借助其他辅助设备。
The crane can rotate 360 degrees, which means it can move forward, left, right, after all more than 10 meters to grab and rotary lifting objects, without the aid of other auxiliary equipment.
虽然与直升机外观相似，但自转旋翼机必须依靠向上流过桨叶地气流维持旋翼地旋转，产生将飞行器维持在空中地升力以及向前飞行地推力。
While similar to a helicopter rotor in appearance, the autogyro's rotor must have air flowing up and through the rotor disk in order to generate rotation.
滚动，使转动：使…以绕轴旋转或不断滚动的方式沿一水平面向前运动。
To cause to move forward along a surface by revolving on an axis or by repeatedly turning over.
本发明特征在于，刷（13）相对于旋转筒的旋转方向向 外及向前延伸。
The invention is characterised in that the brushes (13) extend outwards and forwards relative to the direction of rotation of the rotating cylinder.
佳能可以向前或向后推，和旋转360度。
The Canon can be pushed forward or backward, and rotated 360 degrees.
产品说明：GX型螺旋输送机是用螺旋的旋转将物料沿壳体向前推进而达到输送的目的。
Description: GX-type screw conveyor is screw rotation of the material along the shell to move forward to achieve the purpose of transportation.
它源自于词根“坦”，翻译起来就是延伸、扩展、蔓延、持续、旋转发出、迂回前进、向前、展现或者出现。
It derives from the root word tan, which translates as "to extend, expand, spread, continue, spin out, weave; to put forth, show, or manifest."
该款龙头手柄向前旋为冷水状态，向后旋转为混合水状态，没有全热水状态，防止烫伤。
When the handle rotates to the front, it is cold water; to the back, the mixed water. There is no complete hot water in order to avoid scalding.
固态塑料由料斗进人料筒后，随着螺杆的旋转向机头方向前进，在此过程中，塑料的物理状态在不断发生着变化。
After solid plastics from the hopper into the barrel, as the rotation of the screw head direction, in the process, plastic physical conditions are constantly changing.
固态塑料由料斗进人料筒后，随着螺杆的旋转向机头方向前进，在此过程中，塑料的物理状态在不断发生着变化。
After solid plastics from the hopper into the barrel, as the rotation of the screw head direction, in the process, plastic physical conditions are constantly changing.
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