Operculums
n. [昆] 盖；鳃盖
🗣️ 情景例句
No. But I have to.
没有 ，但有此必要。
I will go to the sportsfield.
我将去运动场。
It must have been a gas that could burn but that would not explode, a gas that did not smell strong, and a gas that did not kill people.
它一定是一种能够燃烧而不能爆炸的气体，一种味道不很强的而且不使人致死的气体。