An ungrateful man is like a hog under a tree eating acorns, but never looking up to see where they come from.

An ungrateful man is like a hog under a tree eating acorns, but never looking up to see where they come from.

忘恩负义的人就像树下的猪吃橡子，却从不抬头看橡子从何而来。

-- Timothy Dexter 蒂莫西·德克斯特