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VERB
(鸟)啭鸣，唧啾
If a bird trills, it sings with short, high-pitched, repeated notes.
例句
At one point a bird trilled in the Conservatory.
有那么一刻，一只鸟儿在温室里啼叫。
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VERB
尖声地说(或笑)
If you say that a woman trills, you mean that she talks or laughs in a high-pitched voice which sounds rather musical but which also sounds rather irritating.
例句
'How adorable!' she trills.
“真可爱!”她尖声说。
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N-COUNT
颤音
A trill is the playing of two musical notes repeatedly and quickly one after the other.