It says that the forward rate, which you can compute from today's newspaper or from today's website--you can compute the forward rates for all future dates.
这些告诉我们,人们可以从今天的报纸,或网上的信息中计算出,未来任意时刻的远期利率
The answer was: at any time t, the location of the particle is given by this formula.
答案是,在任意时刻 t,这个质点的位移都由这个式子给出
Consequently, for this object the position y, at any time t is known to be 15+10t-5t^.
因此,对这个物体来说,在任意时刻的位移y,就应该为15+10t-5t^
We know it's going around in a circle because if I find the length of this vector, which is the x-square part, plus the y-square part, I just get r square at all times, because sine square plus cosine square is one.
我们之所以知道它做圆周运动,是因为我求出了这个矢量的模长,也就是 x 的平方加上 y 的平方,我就得到了它在任意时刻的模长平方,因为正弦平方加余弦平方始终等于1
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