dilate

vt.

1. 擴大；使膨脹
   The cat dilated its eyes.

   貓瞪大眼睛。

vi.

1. 擴大；膨脹
2. 詳述；細說[（+on/upon）]
   If there were time, I could dilate on the subject.

   要是有時間，我可以詳細談談這個問題的。