大提顿公园的叉角羚更值得注意，是因为它们的迁徙路线一成不变，并受到三个关键地点(“捕捉器地点”、“红山”和“漏斗”)的严重威胁。
The Grand Teton pronghorn are notable for the invariance of their migration path and the severity of its constriction at three critical spots, known as Trappers Point, the Red Hills, and the Funnel.
一个是我保持a恒定,那么当然b就会变化，因为这个宽是不变的。,那么当改变θ角时，高度增加了，从而这条边的长度增加了。
One is I keep a constant, and then of course b will have to change because if this width stays the same, then when I change theta, the height increases, and then this side length increases.
它按着既定的方式改变,因此当θ改变时，a保持不变，同时b改变,从而我们保持为直角三角形。
It changes in whatever way it has to change so that when theta changes, a stays the same while b changes so that we keep a right triangle.
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