柯林斯詞典bell jar 1. N a bell-shaped glass cover used to protect flower arrangements or fragile ornaments or to cover apparatus in experiments, esp to prevent gases escaping 鐘形玻璃罩 返回 bell jar劍橋詞典a large glass cover shaped like a bell used to cover chemical equipment , especially to prevent any gas from escaping 鐘形罩 返回 bell jar