这四颗行星将在本月中继续在天空中拥抱东方的地平线，而奋进号现在正按照预定，准备于 6 月 1 日开始它的最后一次旅程。
The four planets continue to hug the eastern horizon at dawn throughout the month, while Endeavour is now scheduled to make its final approach to planet Earth on June 1.
日落之时就是太阳的最后一点降至地平线以下。
Sunset is when the very last bit of the sun appears to dip below the horizon.
如果你看到日落地平线——确切是说是太阳最后一丝余辉消失的时候，你将看到一条瞬间的的绿色火焰划过天空。
If you look at the horizon at sunset-exactly as the last sliver of sun disappears-you might see a flash of brilliant green blaze across the sky.
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