bottom jar

基本解释

The diameter of the edge of the jar lid is matched with that of the gutter bottom of the jar gutter.
坛盖边沿的直径与坛檐槽槽底的直径相配合。
ip.com
Simply put some sand in the bottom of the jar (colored play sand works great for this) and add the seashells.
只要将沙子铺到瓶底，（如果是彩沙就更漂亮了）然后再放入贝壳。
To my amazement, there, as if it had never been removed, stood the old pickle jar, the bottom already covered with coins.
令我感到惊讶的是，那儿放着那个旧泡菜坛，坛底已经铺满。
lanxicy.com

The butterfly would flutter for a few moments, sink to the bottom of the jar, and slowly expire.
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At the bottom of the killing jar was a piece of cotton saturated with carbon tetrachloride.
NPR: Excerpt: 'At Large and At Small'
At the bottom of the chest, in an olive jar, he placed a detailed autobiography, printed so small a reader will need a magnifying glass.
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