Cornstone
n. [地]玉米灰岩
🗣️ 情景例句
It's Grandma's recipe.
这是奶奶的配方。
What will you do to help protect our environment from being seriously polluted?
你将为帮助保护我们的环境免遭到污染做些什么呢？
A burst of activity associated with the laying of submarine cables soon confirmed the Challenger's observation that many parts of the ocean were two to three miles deep,
海洋中很多地方可深达两三英里，