It's all about rotational mechanics. When you turn your hands over you're rotating them around their centre point, which is near the middle of your palm.
这是一个力学常识，当你翻转手掌时，手掌是以掌心为中心旋转地。
When the clip is playing, he can wave a palm at the screen to call up the controls to rewind the video or turn up the volume.
当视频播放时，他可以对着屏幕挥动手掌激活控制菜单，倒回视频或者调高音量。
The rate of this deforestation is rising as oil prices reach new highs, leading more industries to turn to biodiesel made from palm oil, which, in theory, is earth-friendly.
然而随着油价不断攀升，这里的森林砍伐正在愈演愈烈。许多工厂都转向用棕榈油生产生物柴油，具有讽刺意义的是，这样的做法从理论上来说是环保的。
Right palm on left knee and left palm back, with exhale, turn back with inhale, looking front, same practice with another side.
右手放在左膝上，左手放在身后，吸气时，身体向后转，注视前方，另一侧，做同样的练习。
Teach your child that, when coughing, sneezing, or burping, it is appropriate to turn his head away from others and cover his mouth with the palm of his hand. Using fist is not acceptable.
教导孩子咳嗽，打喷嚏或者打嗝时要把头转向一边，并且用手掌而不是用拳头遮住嘴巴。
Teach your child that, when coughing, sneezing, or burping, it is appropriate to turn his head away from others and cover his mouth with the palm of his hand. Using fist is not acceptable.
教导孩子咳嗽，打喷嚏或者打嗝时要把头转向一边，并且用手掌而不是用拳头遮住嘴巴。
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