Because gravity is in this direction.
因为重力是这个方向的。
And you say, "This is the direction of gravity" which is as real for you as it can be.
你会说，重力方向是个方向的“，就像真的有这个方向上的重力一样。”
The next parameter is the direction and speed of gravity.
下一个参数是重力的大小和方向。
So now you perceive gravity in this direction which is very real for you.
也就是在这个方向上，感觉到重力。
You're right in that case, but nevertheless you say "Gravity is in this direction."
也许我的确疯了，但你会告诉我，重力是这个方向的。
So I say, "In what direction do you perceive gravity?"
我还是问你，你感觉重力是什么方向的？
So now I ask you "Ah, in what direction do you perceive gravity?"
我再问你，你感觉到重力的方向是怎样的？
And so I say to you, "In what direction do you perceive gravity?"
我问你，你感觉到重力是哪个方向。
And I say, "Hello, there, in what direction is gravity?"
我说，“喂，重力方向是怎样的？”
When you were standing here and I first ask you "in what direction is gravity?"
你在这里的话，我先问你们，重力是什么方向的？
Okay, so now I say to you "In what direction do you perceive gravity?"
好我再问你,你感觉到重力是什么方向
And you will say, "Well, gravity is in this direction."
你会告诉我，是这个方向。
But you cannot simply walk here because gravity is always in this direction.
没有楼梯是行不通的，因为重力总保持这个方向。
If the direction is opposite with gravity, the resultant force is a levitation force.
若使合力总是指向重力的反方向，则这个合力是一种无支撑的悬浮力。
If the direction is opposite with gravity, the resultant force is a levitation force.
若使合力总是指向重力的反方向，则这个合力是一种无支撑的悬浮力。
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