Annularity
n. 环状, 轮状
🗣️ 情景例句
It's nice to see you again.
很高兴再见到你们。
Let difficulties occur but not the loss of courage.
纵使困难重重，也不丧失勇气。
for five of her sixteen watertight compartments had already been flooded!
16个密封舱已有5个进水。