践踏；骑马赶上

grinding down───折磨；磨损

rigging down───折卸钻机，拆卸钻机

trading down───降级消费；向下经营

winding down───平静下来；放松一下；（钟表等）慢下来

writing down───写下；减低账面价值；把…描写成

living down───v.改正行为而使…被人遗忘

piping down───安静下来；吹哨停工

wiping down───把…上下揩干净

These features permit the rider to get more control as they are riding down the mountain.───这些特性允许车手获得更多的控制权，因为他们骑马下山。

Protected by plate armour these units are very good at riding down archers and infantry.───身着板甲的他们善于冲击弓箭手和步兵。

Two guys were riding down the street in a car.───两个人开车行驶在大街上。

The next day, as Obama was riding up on an escalator, a woman riding down next him beamed.───第二天，当奥巴马乘自动扶梯上楼的时候，旁边的一位女士正好下楼。

Wearing mail armour, shield and riding a bared horse, these lance-wielding warriors are capable of charging and riding down their foes.───穿着锁子甲，带盾并骑着骏马，这些使骑枪的武士可以冲锋并摧毁他们的敌人。

Riders say one of the highlights of Bike Week is riding down Main Street in Daytona Beach.───骑手们说摩托周的一个亮点是在代顿海滩的主要街道上骑行。

In years to come, it may even guarantee the security of passengers in cars and trucks riding down automated highways.───再过数年之后，GPS技术甚至可确保客货车内的乘客，安全地驰骋在自动化高速公路上。

RIDING DOWN: A man took an escalator inside the National Retail Federation Annual Convention and Expo in New York on Monday.───骑马踩倒了：一名男子，并于周一内的美国零售联合会年会和博览会在纽约自动扶梯。

How dreary life gets over in that house! ' l reflected, while riding down the road.───“这家人的生活多闷人哪！”我骑着马在大路上走的时候想着。

Riders say one of the highlights of Bike Week is riding down Main Street in Daytona Beach.

Lifting his eyes to the dizzy altitude of its summit the officer saw an astonishing sight - a man on horseback riding down into the valley through the air!

I do that riding down the road, make up my own stories about people and places.

Protected by plate armour these units are very good at riding down archers and infantry.

Several Oglala men, many wearing war bonnets, on horseback riding down hill. Photo by Edward S. Curtis, 1907.