Song of Tomorrow

Song of Tomorrow
Tomorrow comes after tomorrow.
Endless tomorrows ahead lie.
If you always wait for tomorrow,
Your time will slip idly by.
That is the case with so many people,
Spring goes,autumn comes till old age arrives.
They watch the river flow eastward in the morning,
And see toward evening the sun sink in the west.
How many tomorrows can you have in lifetime?
Pray listen to my song of tomorrow.
这是一首诗歌,帮忙翻译一下.