机件的尺寸精度和几何精度是保证机件功能要求及互换性的关键因素。
Accurate dimension and geometry of a machine part are key factors ensuring its desirable functions and interchangeability.
为确保上述情况的互换性，使用者应在使用前确定互换前后功能等效或测定上述特性。
To assure interchangeability in such instances, users may wish to ascertain functional equivalence or determine such characteristics before use.
为了允许在制造过程中必然会发生的精度变化，并提供零件的互换性和正确功能，一个公差系统是必需的。
A system of tolerances is necessary to allow for the variations in accuracy that are bound to occur during manufacture, and still provide for interchangeability and correct function of the part.
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