每小时...英里

He throttled the car down to20 miles an hour.

他关小油门把车速减慢到每小时20英里。

In the open ocean, tsunamis typically move at speeds of 500 to 600 miles (800 to 970 kilometers) per hour.

在开阔的海面，海啸一般以每小时500到600英里（800到900公里）的速度前进。

In the open ocean, tsunamis typically move at speeds of 500 to 600 miles (800 to 970 kilometers) per hour.

通常而言，在开放海域，海啸的移动速度会达到每小时500至600英里

It takes pictures of them as it whirls around Earth at 17,500 miles an hour.

然而它是以每小时17.500英里的速度在地球轨道上对他们进行拍照。

We zipped along at a minimum of 55 mph.

我们以最低每小时55英里速度飞驶。

It has been pointed out, for example, that in 6000 BC the fastest transportation available to man over long distances was the camel caravan, averaging eight miles per hour.

譬如，有人指出，在公元前6千年的时候，人类远距离交通的最快手段是骆驼运输队，平均每小时8英里。

It has been pointed out, for example, that in 6000 BC the fastest transportation available to man over long distances was the camel caravan, averaging eight miles per hour.

譬如，有人指出，在公元前六千年的时候，人类可使用的最快的远距离交通手段是骆驼运输队，平均每小时八英里。

It has been pointed out, for example, that in 6000 BC the fastest transportation available to man long distances was camel caravan, averaging eight miles per hour.

例如，有人指出，公元前6000年，人们长途旅行的最快工具是骆驼车，平均每小时8英里。Averaging分词短语，此处是补充说明，进一步提供信息。

Although the car frame has come to a stop, the remainder of the car continues to travel at a velocity of 55 miles per hour.

虽然汽车大架已经停止下来，但汽车的其它部件仍然在以每小时55英里的速度前行。

We're flying at an altitude of 37,000 feet and our airspeed is 400 miles an hour.

We're 飞行在高度37，000 英尺和我们的空速是400 英里每小时。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。