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.
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.
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。
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