有些脚垫放在前脚掌处,可以防止脚向前滑动。
Some foot cushioning products will sit under the ball of the foot to prevent the foot from sliding forward in the shoe.
请不要回头去追,你应该向前奔跑,因为快乐在前方!
Please do not go back to chase, you should run forward, because happiness in front!
那就是向前迈一小步,步虽小毕竟是在前进。每时每刻都有很多方式向前迈进一小步。
A tiny step forward is, after all, a step forward. And there are plenty of ways, in every moment, to take just a tiny step forward.
If that's all it knows, then in that scenario there is no building or anything else; it continues a trajectory both forward in time and backward in time, and it says that whatever seconds, one second before you set your clock to 0, it would've been on the ground.
如果是这样,在那种模式下,没有楼房或者别的什么,物体的运动轨迹可以沿时间可以向后延伸,也可以向前延伸,不管时间取什么值,在零点前一秒时,物体就在地面上
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