So from the time I came in till the BG finally arrive is half an hour already.

所以从时间，我来到在等到BG 抵达，是半小时了。

The City Mouse and the Country Mouse finally arrive at the City Mouse's red brick house.

城市老鼠和乡下老鼠终于到了城市老鼠的红砖屋。

The City Mouse and the Country Mouse finally arrive at the City Mouse's red brick house .

城市老鼠和乡下老鼠终于到了城市老鼠的红砖屋。

On the other hand, it is found that choosing the appropriate coordinate system can effectively reduce the integration variable dimension and finally arrive at the same result.

另一方面，发现可以通过选取合适的坐标系可有效地降低积分动量的维数，同样可以求得关联函数的解析式来。