Typically, a black hole is surrounded by a doughnutshaped region, or torus, of gas.

典型的黑洞由气体构成的环状区域—气环围绕着.

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The compression rings seal the air - fuel mixture and also the combustion pressures as the mixture Burns.

当可燃混合气压缩时,气环密封可燃混合气;当可燃混合气燃烧时气环可阻止所产生的压力不外溢.

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