ㄟ............... 这段英文没有讲到『从太阳来的asteroids命中南半球的机率比北半球小』吧 :) Second,if an asteroids is coming from the direction of the sun, it cannot be seen because the sun is too bright. 如果小行星是从太阳的方向过来，因为太阳太亮，所以我们会看不到它 Finally,thereis no large-scale program in the southern hemispthere to try to find asteroids. 南半球没有大型的小行星观测计画 "旅人" <[email protected]> 撰写... > 这是我的英文课本的其中一段话 > Today,the governments of serveral countries try to locate > NEAs(near-Earth asteroids). Universit and amateur astronomers > also watch out for dangerous asteroids. However,there are problems. > First,most asteroids are small and dark. That makes then difficult > to spot. Second,if an asteroids is coming from the direction of > the sun,it cannot be seen because the sun is too bright. > Finally,thereis no large-scale program in the southern hemispthere > to try to find asteroids. > 中间说的又黑又小所以不好找这还理解 > 不过後来说的”从太阳来的asteroids命中南半球的机率比北半球小” > 这就不太清楚了 > 是因为南半球的面积比较少这样而以吗？ > 还是还包含地球倾斜的角度、形状(椭圆形)...等 > 或者还有其他理由呢？ > 请内行解答，谢谢！