Down and down
顺俯───Down and down
Up is down and down never happened.───涨即是跌，而下跌从未发生过。
I kept my eyes riveted on the road directly ahead. Down and down I went.───我两眼直视前方，一路下坡又下坡。
They saw the light go down and down.───他们看着灯光越来越往下去。
He swam in the dark, cold water as hard as he could, but he went down and down.───他在黑暗冰冷的水里奋力游，然而他的身子却愈来愈往下沉。
She was falling down and down into a very deep hole.───她摔倒了掉进一个很深的洞里。
But once the cold or down and down, in other words upward moves into a downward rigidity, to further increase (up to re-bid) very difficult.───但是一旦跌下来和冷下来了，换句话说向上刚性转变成向下刚性，要想再上去（重新转为向上刚性）就非常困难。
She knelt by the trunk, flinging aside papers, reaching down and down, scrabbling in the corners.
And then it plunged down and down and down.
Down and down fell Tom Thumb, till at last he struck the water.
Behind him is the abyss, the gaping cavern of the gold mine, down and down into the earth.
He swam down and down but touch bottom.