customs stemming from the past;
来自过去的习俗;
customs stemming from the past;
来自过去的习俗;
Good stemming, occupying at least 1/ 3 of the shothole, prevents the formation of large amounts of toxic gases.
很好的封堵炮眼,至少占整个炮眼的1/3,可抑毒性体的。
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