"he pronounced his R's with a distinct trill"
"Some speakers trill their r's"
The trills, staccatos, scales and arpeggios of the coloratura specialist.
And music trilled o'er moor and mead.
A skylark flew up, trilling as it climbed.
牛津高階第八版
美國韋氏詞典
Dictionary.com
Free Dictionary
維基百科 (自由的百科全書)