ternary

例句：

1. 1.The terns are flying over the lake in a ternary formation.
   海鸥成群结队地飞过湖面，形成了一个三元阵形。
2. 2.The terns were ternary in their behavior.
   海鸥的行为是典型的三元行为。
3. 3.The terns are known for their ternary feeding habits.
   海鸥以其三元的觅食习性而闻名。