bottom cap

基本解釋

Mould name: P - 201 packing paper tube（paper tube body，top cap，bottom cap and the extrusion nozzle）.
1：模具名稱：P-201包裝用紙管（紙管本體，上蓋，下蓋，擠出嘴）。
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Aluminium is used for the bottom cap for increased durability, lower maintenance and ease of rebuilding.
鋁是用于底部的上限，增加耐用性，降低維護和易用性的重建。
The paper introduces the shaping method improvement and technological trial course of bottom cap of certain model of carrier rocket's fuel tank.
介紹了某型號運載火箭二級燃料箱后底頂蓋成形方法改進及工藝試驗過程。

So my idea was to create a bottle with a cap on the bottom too.
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