在我们北半球，北斗七星是最著名的星群——一组不需验证的星群。
In our northern hemisphere, the Big Dipper is probably the sky's best known asterism - a group of stars that is not a recognized constellation.
光线也在是失去活力，首先，由于地球绕着太阳的轨道，由于地球倾斜的轴线与我们所处的北半球相结合，最直接从太阳所接收到的光线，就愈为遥远。
The light is dying, for one thing, as Earth’s orbit around the sun and tilt on its axis combine to carry us in this hemisphere further away from receiving the sun’s rays most directly.
在北半球，我们现正进入季节性流感的高峰期。
In the northern hemisphere we are now entering the peak period for seasonal flu.
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