An astronomer, a physicist and a mathematician were holidaying in Scotland. Glancing from a train window, they observed a black sheep in the middle of a field.
一个天文学家,一个物理学家和一个数学家到苏格兰去度假。透过火车车窗,他们看到一个牧场里有一只黑色的羊。
Glancing from a train window, they observed a black sheep in the middle of a field.
透过火车车窗,他们看到一个牧场里有一只黑色的羊。
应用推荐