英語詩歌（圣誕節(jié)）有解釋，急急急?。?！

On Going Home For Christmas

He little knew the sorrow that was in his vacant chair;
He never guessed they'd miss him, or he'd surely have been there;
He couldn't see his mother or the lump that filled her throat,
Or the tears that started falling as she read his hasty note;
And he couldn't see his father, sitting sor- rowful and dumb,
Or he never would have written that he thought he couldn't come.

He little knew the gladness that his presence would have made,
And the joy it would have given, or he never would have stayed.
He didn't know how hungry had the little mother grown
Once again to see her baby and to claim him for her own.
He didn't guess the meaning of his visit Christmas Day
Or he never would have written that he couldn't get away.

He couldn't see the fading of the cheeks that once were pink,
And the silver in the tresses; and he didn't stop to think
How the years are passing swiftly, and next Christmas it might be
There would be no home to visit and no mother dear to see.
He didn't think about it -- I'll not say he didn't care.
He was heedless and forgetful or he'd surely have been there.

Just sit down and write a letter -- it will make their heart strings hum
With a tune of perfect gladness -- if you'll tell them that you'll come