a group of seven bright stars in the constellation Ursa Major
elevated railway in an amusement park (usually with sharp curves and steep inclines)
例句
用作名词 (n.)
The Big Dipper can give you a sense of direction when you are lost. 当你迷路时北斗七星可以给你一点方向感。
Follow the arc of the Big Dipper's handle to get to Arcturus, the bright yellowish star in the lower left corner. 顺着北斗七星勺柄的弧度向外延伸，我们很容易看到明亮的大角星，它略泛黄光，在图片左下角。
美
