underwater

1. ADV Something that exists or happens underwater exists or happens below the surface of the ocean, a river, or a lake. 在水面下

...giant submarines able to travel at high speeds underwater. …能在水下高速行駛的巨型潛艇。

Some stretches of beach are completely underwater at high tide. 有些沙灘在漲潮時會完全被水淹沒。

2. ADJ Underwater is also an adjective. 在水下的[ADJ n]

...underwater exploration. …水下勘探。

...underwater fishing with harpoons. …使用魚叉的水下捕魚。

3. ADJ Underwater devices are specially made so that they can work in water. 水下用的[ADJ n]

...underwater camera equipment. …水下攝影設備。