凌空中的物体: moon,star, airplane,satellite,meteor, comet,pianet, Venus, Jupiter 交空中天体的特点:move,still,twinkle,big,bright, circle,curvedsliver, full, dark orange red, tiny, twinkling 与天体运动有关的词: move,orbit,travel, fall compare with...与.....相比较 between...and...在......与.....之间 connect...with...把......与-.--..相连 once in a while 偶尔;有时 beMedwith...装满··.· 宾语从句: Have you ever wondered what they are? 被动语态: At the full moon, the side facing Earth is fully lit up by thesun. 原因状语从句: But since they are so far away, they look very small 现在完成进行时态:People have been looking for constellationssince ancient times. 结果状语从句: Many stars are so far away that it takes millions ofyears for their light to reach Earth.