Speleothem
n. [地]洞穴堆积物(如钟乳石)
🗣️ 情景例句
Due to lack of funds
由于缺乏经费
It is never too old to learn.
为学不怕年高。
That's all right. Why don't you call me Robert or Bob? But please don't call me Mr. Bob.
没关系。你为什么不叫我罗伯特或鲍勃？但请不要叫我鲍勃先生。