Catenabacterium
链状细菌
🗣️ 情景例句
when I was about eighteen years old.
那时我差不多十八岁。
I hope so.
我希望如此。
and a period (which is the time it takes a wave crest to travel one wave length).
和周期（浪峰走过一个波长所需的时间）。