The canal would soon fill up with mud if not regularly dredged.
这条运河如果不经常疏浚，就会淤塞。
His grandfather was a fine raconteur, dredging up quite effortlessly, and with a great wealth of detail, scenes and incidents from his early life.
他的祖父是位很好讲故事的人，不废吹灰之力，就把他年轻时事情、场景，极详细地描绘出来。
