Good stemming, occupying at least 1/ 3 of the shothole, prevents the formation of large amounts of toxic gases.
很好封堵,至少占整个1/3,可抑制大量毒性气体成。
Good stemming, occupying at least 1/ 3 of the shothole, prevents the formation of large amounts of toxic gases.
很好封堵,至少占整个1/3,可抑制大量毒性气体成。
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