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When I see birches bend to left and right Across the lines of straighter darker trees, I like to think some boy's been swinging them.
当我看到白桦树弯下身子，向左，也向右,穿过排列成行的挺直黑黑的树，我总以为有个孩子把白杨“荡“弯了。
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Even in the case of this spring, when you pull it, if you pull it to the right by some force.
甚至是在这样的弹簧问题中,当你拉它的时候,如果你用力向右拉
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We know that ionization energy is going to increase as we go across the periodic table, so that means carbon has a lower ionization energy than nitrogen which is right next to us.
我们知道电离能会随着周期表,向右而逐渐变大，因此碳的电离能比旁边的氮要低一些,那么就像我说的。
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And if you had a motor here that was causing a paddle to move up and down you could cause waves to form at one end of the tank and move from left to right.
如果在水槽里放个发动器,来让水上下起伏,波浪形成于,水槽的一端,然后从左向右扩散。
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In just a moment the hearts are gonna start flowing from bottom to top and the cookies are gonna start moving left and right and they seem to be somewhat synchronized with the music, perhaps based on trial and error by the student who implemented this one.
刚刚那一刻，那些爱心们从底部上浮到顶部,饼干人则向左向右移动,它们似乎都随着音乐的律动而变化着，也许这是那个制作该动画的同学,不断尝试的结果。
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Just looking at this first line: "When I see birches bend to left and right."
看第一句：,当我看到白桦树弯下身子，向左，也向右“
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This is happening while making arm movement from the left into the right.
当手臂从左向右活动的时候，就会出现这样的情况。
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So, in fact, as Thucydides tells us beautifully in Book V, when the two armies actually hit each other they have already made a slight turn to the right.
因此,事实上,像修西得底斯在第五册里优雅描述的那样,当两军真正开始接触时,他们已经略微向右转了
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And we know as we go across a row in the periodic table, what's happening is that z effective or the effective pull on the nucleus is increasing.
而我们知道沿着周期表的某一行向右看，有效核电量,或者说原子核的有效引力是在逐渐增大的。
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Figure out how you can make it move a little to the left, a little to the right, up and down and then repeat in some kind of looping structure.
就是找出办法让它向左移动一小步，向右移动一小步，向上一小步，向下一小步,像这样不断重复。
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On this guy, I have 10 from the left 10 acting this way, 4 acting that way.
对这个物体,受到一个 10 牛的从左向右的力,10牛的力朝这边,4牛的力朝那边
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Then, you may have forces to the right, forces to the left pushing, pulling.
然后你就有向右的力,和向左的力,推力和拉力都有
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When I see birches bend to left and right."
当我看到白桦树弯下身子，向左，也向右“
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Even though the graph is going up and down, the object is moving from left to right.
虽然图上曲线是上下波动,但是物体是由左向右移动的
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When it was louder, the arm was moving to the right.
当声音变大的时候，手臂在向右移动。
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But, you know, in 2D, the options are not just left and right or north and south, but infinity of possible directions in which I could go those 5 km.
但在二维空间中,不仅可以向左向右或者向南向北,我在走那5公里的时候可以有无数个方向
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kg is being pulled by the rope on the right with a force that I'm going to call T, which stands for tension.
千克的物体受到绳子向右的一个拉力,我称它为 T,也就是拉力的意思
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It says, if you pull it to the right, so that x is positive, the spring will exert a force which is in the negative direction; that's why you have a minus sign.
就是说,如果你向右拉,x 取正值,弹簧产生的力方向为负,这就是这里用负号的原因
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