Definition: under the surface of water Level: B2
他们使用水下相机拍摄珊瑚礁。
They used an ___underwater camera to film the coral reefs.
海豹在水下听力很好。
Seals can hear very well ___underwater.
有了潜水设备，你可以探索水下世界。
With diving equipment, you can explore ___underwater worlds.
