Lactos
(lacto 的復數) 乳
??? 情景例句
I really appreciate all of your hospitality.
十分感謝您的款待。
Why didn't you write me?
為什么你不給我寫信？
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.
它一定是一種能夠燃燒而不能爆炸的氣體，一種味道不很強的而且不使人致死的氣體。