The maximum penetration depth of gas flow is increased with the increase of gas momentum while the diameter of oxigen gunjet keeps constant.

气流的最大穿透深度随气体动量的增加而增加，而氧气喷枪的直径保持恒定。

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Early jet engines had narrow inlets and were very noisy, but as the diameter of the fans at the front increased, the engines became quieter.

早期的喷气式发动机进气口狭窄且噪音巨大但是随着前部风扇直径的增大发动机变得越来越安静。

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The opposite of elongation is upsetting, which produces compressive shortening. For example, the diameter of a bar can be increased by heating and hammering axially.

与伸长相反的是镦粗，即产生压缩性缩短。例如，棒料的直径可以通过加热和轴向锤击而增大。

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Also adding to the nostalgia of using an old-fashioned number two is the larger rubber tip, slightly bigger diameter (8mm) and increased length of the pen itself.

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