NASA needs good weather to launch Ares I-X because engineers need to see the rocket flight all the way through first stage separation, which will mark the end of the test.
NASA需要好天气来发射战神I-X，因为工程师们要在第一级火箭分离前观测火箭飞行全过程，第一级火箭分离标志着试飞的结束。
A punctuation mark (,) used to indicate a separation of ideas or of elements within the structure of a sentence.
逗号一种标点符号(，)，用于表示句子结构内思想或要素的分开。
On shape and contour of mesh mark between pre-and post separation, the improvement shows that the method has obvious separation effect.
通过原始图像中接触印痕和分离后齿面印痕的形状和轮廓的比较，分离效果明显。
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