一些人需要复习一点数学课程，正弦的作用是给出在一个直角三角形中的一个已知角所对应的一条边与直角三角形斜边之间的比率。
For anyone that needs a little refresher course, the sine function gives the ratio of the opposite side of a given Angle in a right triangle to the hypotenuse.
已知三角形所有角和一个边，其它边都能求出，答案肯定与前面一致。
You have a triangle with all the angles and one side; you can calculate the other sides and you should find exactly the same answer, of course.
非洲狮幼崽在奥卡万戈三角洲的草地上玩耍。自然资源保护预测，估计除了现在已知道减少的数量外，非洲狮的数量还将明显减少。
African lion cubs play in the grass in the Okavango Delta. Conservationists estimate that unless the current decline is checked, the number of lions will continue to drop significantly.
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