To have an interference or force fit between mating parts, the tolerances must be such as to create a zero or negative allowance.
为了使配合零件之间具有过盈或强制配合，公差必须产生零或负允差。
These changes have been driven by women's increasing education and labor force participation, new gender roles, and the rise of what social scientists call assortative mating.
这些改变来源于以下驱动因素：女性受教育程度提高、加入劳动力大军，新的性别角色以及被社会学家称作的门当户对的婚姻比率正在增加。
The utility model relates to a wind-force exhaust apparatus belonging to the construction field, namely, a mating product.
本实用新型风力排气装置，属于建筑领域，是一种建筑物的配套产品。
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