When the moon is new it looks like an arc of light in the sky.
新月看起来像天空中的一盏弧形灯。
不及物动词 vi.
1.作弧形运动
2.形成电弧
展开词典例句
常用词组
minute of arc
1. 见 minute (义项2)
second of arc
展开词组习语
语源
late Middle English (denoting the path of a celestial object, especially the sun, from horizon to horizon): via Old French from Latin arcus 'bow, curve'
