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The results were as follows.(1) In the backward handspring, the trajectory of CM and horizontal velocity of CM in junior-high and college gymnasts were lower and higher than those of senior-high gymnast, so the vertical velocity is better when they perform tucked backward somersault. College gymnast has higher vertical velocity than junior-high and senior-high gymnasts in take-off moment of backward handspring phase.(2) Senior-high and college gymnasts have more elbow and shoulder angle in take-off moment of backward handspring and tucked backward somersault phase. Therefore, angle of both arm is bigger for performing in hand push away phase in the backward handspring, and increased the reaction force with body in the tucked backward handspring.(3) College gymnast has large knee flexions in hand support and push away moment in the backward handspring, it would increase rotation radius and better moments of inertia in the backward handspring.

结果显示：在后手翻阶段中，较低的重心轨迹和较高的水平速，有於后续空翻的垂直速；大专选手在后手翻阶段起跳瞬间有较高的垂直速；高中及大专选手在后手翻起跳脚地瞬间和团身后空翻起跳脚地瞬间时，肘、肩关节角皆大於国中选手，使其在后手翻起跳地瞬间时，双臂的伸展於后手翻的手推地面的动作，而团身后空翻起跳脚地时，双臂向上摆於身体向上伸展方向的掌握，并使重心有一定的腾空高；大专选手在后手翻阶段的手著地瞬间和手地瞬间的膝关节角较大於高中和国中选手，使其可增加身体的旋转半径，并能获得较佳的下摆动能，而膝关节角小则形成屈膝的动作，导致重心水平速低，减少下摆动能和影响整体动作的节奏和韵。

They are badly off for blankets, and even worse off for food.

他们需要毯子，更需要食物。

The refugees are badly off for blankets, and even worse off for food.

难民需要毯子，更需要食物。在这些教材中出现过。。。

The refugee is badly off for blanket, and even worse off for food.

难民需要毯子，更需要食物。

The refugee be badly off for blanket , and even worse off for food

难民需要毯子，更需要食物

He's badly off, but I'm worse off.

他很穷，但我更穷。

You want to drop off that bag at POW barracks 2 before the guards take It off you.

你要在警卫从你身上拿走这个袋子之前就在集中营兵营2丢掉。

When will you be off duty? 2. When are you off duty?

用现在时态，还是将来时好呢？

When it was time to be off duty, I turned off my office computer and I settled back on my office chair.

该下班的时候，我关掉电脑，靠在办公椅上，感觉好舒服哦！

On March 30, 1981 afternoon, when Reagan's president Cong Huacheng Du Xier pauses when restaurant comes out, the youth of a be off one's head blasted off to him a chain of contain volatile bullet.

导读：1981年3月30日下午，当里根总统从华盛顿希尔顿饭店出来时，一个神经错乱的青年向他发射了一连串带有爆炸性的子弹。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。