为繁殖产生氧化氮的细菌，必须消除某些氧。
You have to remove some oxygen to do it, so that nitrous oxide-producing bacteria can thrive.
为繁殖者普遍认同的一点是，他们所繁殖的宠物级幼犬的数量是赛级幼犬的五倍。
Well-established breeders have probably produced five times the number of pet puppies as they have show dogs.
许多以纳特龙湖为繁殖地，因为这里食物充足，筑巢区比比皆是，而且纳特龙湖与世隔绝，不受干扰。
Many depend on Lake Natron as a breeding site because food is plentiful, nesting sites abound and the lake is isolated and undisturbed
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