動詞 dilate:

1. become wider
   同義詞：distend
2. add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing
   同義詞：elaborate, lucubrate, expatiate, exposit, enlarge, flesh out, expand, expound

1. If there are time, I can dilate on the subject.
   要是有時間，我可以詳細談談這個問題的。
2. The horse dilated its nostrils.
   那匹馬張大它的鼻孔。
3. The cat dilated its eyes in the darkness.
   貓在黑暗中睜大眼睛。

di.late

v.（動詞）
di.lat.ed,di.lat.ing,di.lates
v.tr.（及物動詞）
To make wider or larger; cause to expand.
使膨脹：使更寬或更大；引起膨脹
v.intr.（不及物動詞）
To become wider or larger; expand.
膨脹：變得更寬或更大；膨脹
To speak or write at great length on a subject; expatiate.
詳述：就一個話題詳細地說或寫；詳述

來源：
Middle English dilaten
中古英語 dilaten
from Old French dilater
源自 古法語 dilater
from Latin dol3t3re [to enlarge]
源自 拉丁語 dol3t3re [擴大]
dis- [apart] * see dis-
dis- [分開] *參見 dis-
l3tus [wide]
l3tus [放大的]

【引伸】
dilat.abil.ity
n.（名詞）
dilat.able
adj.（形容詞）
dilat.ably
adv.（副詞）
dila.tive
adj.（形容詞）