用“drainage ditch”造句大全，drainage ditch造句

Every schoolchild here learns the legend of "the great Yu," whose prodigious feats of canal building and drainage ditch digging 4, 000 years ago put an end to killer floods on the Yellow River.

Insist that they be treated with respect, not used as garbage dumps or drainage ditches, but as living systems essential to the wellbeing of society.