The ball really follows a smooth curved path, so why do batters sometimes look so foolish swinging at them?
球确实顺着平滑弯曲的道路，那么为什么击球者有时会看起来如此愚蠢地去摆动它们？
Sometimes the outline of a concave revoluted curved surface in axonometric projection would be complicated when there are some singular points on the outline.
在轴测投影中凹回转曲面的外形线可能存在尖点，这就使凹回转曲面的外形线变得复杂。
Upon completion of subgrade filling for railways or highways, sometimes the straight line and curved line cannot close due to errors in construction or other reasons.
公路或铁路路基填筑完后，因前期施工过程中导线不通视及施工误差等多种原因，会出现直线与曲线不能闭合的情况。
It's that curved 'tail' of stars looping down toward the southern horizon that does the trick. The star Antares is sometimes called the Heart of the Scorpion.
那是由于在南方地平线处那弯曲的尾巴而得的心大星一般被认为是天蝎座的中心。
It's that curved 'tail' of stars looping down toward the southern horizon that does the trick. The star Antares is sometimes called the Heart of the Scorpion.
那是由于在南方地平线处那弯曲的尾巴而得的心大星一般被认为是天蝎座的中心。
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