In the beginning you could have taken the left foot up. There was no binding order.
开始你可以抬起左脚，没有任何的限制。
For example, if you want to take a step backwards, you can pick your front foot up first.
比如，如果你要往后退一步，你会首先抬起前脚。
Study and research is like climbing a ladder to climb step by step, to a foot up four or five steps, the ground's day, that must be wrestling.
学习和研究好比爬梯子，要一步一步地往上爬，企图一脚跨上四五步，平地登天，那就必须会摔跤了。——华罗庚。
Sit down and pull your foot up on your knee or rest your foot on a footstool to get it closer to your eyes.
坐下来，把你的脚扳到膝盖上，或者把脚放在脚凳上，离眼睛近一点。
By the time you lift your foot up off the ground, the electrons will have spread around your entire body, giving you a negative charge.
当你的脚向上抬起离开地面时，这些电子就会流散到你全身，令你带负电。
By the time you lift your foot up off the ground, the electrons will have spread around your entire body, giving you a negative charge.
当你的脚向上抬起离开地面时，这些电子就会流散到你全身，令你带负电。
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