The unequal depths of falling and rising branches of the colour curves can be explained by the gas stream from the M-type supergiant component.

文中，我们用M型子星的气流来解释色指数曲线的下降段和上升段深度不等的现象。

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Levels then peak between 2 a. m. and 4 a. m., before falling again.

其浓度在凌晨2点和4点之间达到最高值，然后再次下降。

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The falling star described a long curve m the sky.

流星在天空划出一道很长的弧线。

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