这个“二人组”就成了已知最古老的化石证据，来支持无气门亚目一类螨虫的搭便车现象，或称寄载现象。

That makes the duo the oldest known fossil evidence of hitch-hiking behavior, or phoresy, in a large group of mites called the Astigmata.

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有内胎式轮胎气门是直接做在内胎上的，无内胎式轮胎的气门安装在轮毂上。

On the tire with an inner tube, the valve is mounted on the tube. On the tubeless tire, the valve is mounted on the wheel rim.

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在气门下降段，将气门的落座速度和下降段缓冲包角取小些，使得气门落座平稳，无激烈的冲击现象。

During the drop, better have a lower speed of resitting and a smaller wrap Angle, which can have a smooth resitting without fierce impact.

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