大径指过外螺纹牙顶或内螺纹牙底的圆柱面直径。
The root of the external thread or the crest of the inner thread .
瓶体底部设底盖，该底盖包括可通过螺纹旋合在一起的内底盖和外底盖。
A bottom cover is arranged at the bottom of the bottle body; the bottom cover comprises an inner bottom cover and an outer bottom cover which are screwed together by thread.
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