3. The primary and mating seal faces are lapped to a maximum of 3-helium light bands flatness to provide effective sealing and leakage protection.
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the primary and mating
主要的和交配的
以上为机器翻译结果，长、整句建议使用 人工翻译 。
"We, along with other people, had assumed that this was the primary mating event for this species and a lot of other related species, " he said.
BBC: Yorkshire bat colonies 'cohabit all year'
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