英汉例句双语例句Looking skyward along the Milky Way's arc from the left are Alpha and Beta Centauri, the Coalsack, the Southern Cross, and the Carina Nebula.朝天空看，循着银河的亮弧，从左边半人马α和β（南门二与马腹一），至煤袋星云，南十字，船底星云。coalsack nebula更多例句词组短语短语Coalsack Dark Nebula 英语coalsack nebula更多词组