| 摘要 |
<p>The plastic bottle is made from flexible material and has an external thread (21) on its neck. Below the screw there is a parallel portion which has an external collar (25). The collar is integral with the bottle and has smooth cylindrical side (24) and a flat base (23). One part of the collar has a drain slot (27) and a detached wall segment (26) held at the base only. When the stopper is forced screwed home, it is forced into the collar and can only be released for unscrewing by the downward force (F) distorting the collar and releasing the stopper.</p> |
