和音爆有关的气压变化只有每平方英尺几磅——大约是坐电梯向下两到三层所感受到的气压变化。
The change in air pressure associated with a sonic boom is only a few pounds per square foot — about the same pressure change experienced riding an elevator down two or three floors.
音爆是以每平方英尺的超压磅数来测量的。
Sonic booms are measured in pounds per square foot of overpressure.
这很难找到一个窗口的机器重量轻于46磅，而这样的机器也只能够凉快相当小的房间(150平方英尺或以下)。
It's tough to find a window unit that's lighter than 46 pounds-and a machine like that would be able to cool only a fairly small room (150 square feet or less).
这是个什么概念呢？ 150磅的人给地面的压力仅为3磅每平方英尺。
To put that pressure in perspective, a 150 pound person exerts only about 3 pounds per square inch.
这很难找到一个窗口的机器重量轻于46磅，而这样的机器也只能够凉快相当小的房间(150平方英尺或以下)。
It's tough to find a window unit that's lighter than 46 pounds-and a machine like that would be able to cool only a fairly small room (150 square feet or less).what makes them so heavy?
这很难找到一个窗口的机器重量轻于46磅，而这样的机器也只能够凉快相当小的房间(150平方英尺或以下)。
It's tough to find a window unit that's lighter than 46 pounds-and a machine like that would be able to cool only a fairly small room (150 square feet or less). What makes them so heavy?
牺牲雨林多达220平方英尺只能生产1磅的汉堡包。
Up to 220 square feet of rainforest are sacrificed to produce just one pound of hamburger.
来一个对比吧。 在海面下3英里的深度，水压也不到7000磅/平方英尺。
As a comparison, pressures three miles below the ocean surface are less than 7, 000 pounds per square inch.
美国爆破专家日前引爆了800多磅(约360公斤)的炸药，将一所面积近百万平方英尺、21层高的医院夷为平地。
Demolition experts detonated over 800 pounds (360 kilograms) of explosives, toppling a million-square-foot, 21-story Baptist Memorial Hospital where Elvis Presley died.
美国爆破专家日前引爆了800多磅(约360公斤)的炸药，将一所面积近百万平方英尺、21层高的医院夷为平地。
Demolition experts detonated over 800 pounds (360 kilograms) of explosives, toppling a million-square-foot, 21-story Baptist Memorial Hospital where Elvis Presley died.
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