1. The terns were diving into the water to catch fish.
这些燕鸥正在潜水捕鱼。

2. I saw a group of terns flying gracefully over the ocean.
我看到一群燕鸥在海洋上婉转飞翔。

3. The terns migrate south for the winter months.
这些燕鸥在冬季南飞。

4. The terns have distinctive black caps on their heads.
这些燕鸥头上有独特的黑色帽子。

5. The terns are known for their elegant flight patterns.
这些燕鸥以优雅的飞行方式而闻名。

6. We saw a colony of terns nesting on the beach.
我们看到一群燕鸥在海滩上筑巢。