When it passes, he deftly removes the vent’s protective grating and crawls inside.
然后，他拆开了排气口的防护栅栏，爬了进去。
The present invention discloses a manufacture method for a composite layer of a complex alloy steel pipe, a fastening element, and a protective grating.
本发明公开了一种多元合金钢管、紧固件、防护栏复合层的制作方法。
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