1·Stand with your feet apart and your hands facing upwards.
两脚叉开站着，双手向上。
—— 《牛津词典》
2·The air flowing over a bird's wings curls upwards behind the wingtips, a phenomenon known as upwash.
流过鸟翅膀的空气在翼尖后向上流动，这种现象被称为上升流。
3·In order not to be heard, she pointed her finger upwards to signal that someone was moving about upstairs.
为了不让别人听见，她向上伸出手指示意有人在楼上走动。
4·As with Sisyphus, the boulder was painstakingly rolled upwards only to tumble back down again in an absurd exercise of futility.
和西西弗斯一样，巨石费力地向上滚动，结果又滚了下来，徒劳无功。
5·When you're running, if your heel touches the ground first, your entire weight is impacted upwards into your knees with every step.
当你跑步时，如果你的脚后跟先着地，那么你整个身体的重量都会向上影响到你的膝盖，每一步都如此。