Exocoel
外腔
🗣️ 情景例句
We had a great time, Mom.
我们玩得非常开心，妈妈。
How thick is the ice here?
这儿的冰有多厚？
Only good scouting is likely to preserve the freedoms so dear to the heart of the eternal Boy Scout.
只有优良的童子军活动才能保持不朽的童子军所衷心热爱的各项自由。