形容詞 triangular:

1. having three angles; forming or shaped like a triangle
2. involving three parties or elements
   同義詞：trilateral, tripartite, three-party, three-way
3. having three sides
   同義詞：trilateral, three-sided

1. This island is triangular in shape.
   這個島的外形呈三角形。
2. A triangular insert, as in the seam of a garment, for added strength or expansion.
   襯料一種三角形的插入物，在衣服的縫合處，為加固或加大衣服而用
3. It's a film of triangular love affair.
   那是個三角戀愛的電影。
4. She has a scarf made of a triangular piece of blue silk.
   她有一條用三角形藍綢子做的圍巾。