Dewar flask
dewar-flask的词性：
n.（名词）
1. An insulated container used especially to store liquefied gases, having a double wall with a vacuum between the walls and silvered surfaces facing the vacuum.
德瓦烧瓶：特别指用于贮藏液态气体的真空容器，有双层壁，壁间为真空，接触真空的表面镀银
dewar-flask的词源：