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1.The Mach region is where the speed of sound is highest, and it's where most supersonic aircraft operate.
马赫区域是声速最高的区域，也是大多数超音速飞机操作的区域。
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2.The Mach region is a critical area for understanding the behavior of matter under extreme conditions.
马赫区域是理解物质在极端条件下行为的关键区域。
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3. In the Mach region, the air pressure decreases rapidly due to the high speed of sound.
在马赫区域，由于声速的快速增加，空气压力迅速下降。