他们发现这些记号和昼夜变更和月相变化有关。
They have found that it is connected with the passage of days and the phases of the moon.
月相变化规律是高等师范学校地理专业《地球概论》中的一个重点和难点内容。
The laws of phase in earth generality course of geography speciality at higher normal university which are the difficult point for student's understand and teacher' explain in the class.
月相变化规律是高等师范学校地理专业《地球概论》中的一个重点和难点内容。
The laws of phase in earth generality course of geography speciality at higher normal university which are the difficult point for student's understand and teacher' explain in the class.
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