Now, mind you, I haven't moved anything except our point of view here, so at all times the Moon is always half lit, and half dark.

现在我要提醒你，我没有移动任何东西，仅仅改变了我们观察月亮的角度。

Then, three weeks or so after new Moon, and a week after full, the Moon is once again half lit, the terminator splitting the Moon's face in two even halves.

朔月三周，即满月一周后，月亮再次半满，晨昏线把月亮分成两半。

It cuts right down the middle of the visible face of the Moon, so it's half lit, with the sunward side of the Moon visible and the other side dark.

它正好把月球可见的一面分成两半，所以月亮半亮半暗，朝向太阳的一半可见，另一半黑暗。