guitar中u不发音是因为ui作为一个字母组合是约定俗成的读音，一般情况ui在起，u不发音或ui发丨i｜
因为字母组合ui发/ɪ/音。
She's no slouch on the guitar.
她是弹吉他的好手。
She played a tune on her guitar.
她用她的吉他弹了一支曲子。
This guitar is a delight to play.
这吉他弹起来很惬意。
As he sang, he strummed his guitar.
他边唱边拨着吉他。
My father bought me an electric guitar for my birthday.
我生日的时候父亲给我买了一把电吉他。
