He hums to himself, he growls out tunes, he waves his arms.

他时而哼哼呀呀自言自语，时而大声咆哮高歌，奋力地挥舞着臂膀。

They both execrated the place in very strong language, and gradually growled themselves out, and had nothing left to say.

他们俩都用非常强硬的语言对这个地方进行了解释，并逐渐咆哮着，无话可说。

There are regional dialects that are notable for lacking rhoticity, such as the classic Bostonian Pahk yah cah in Hahvahd Yahd for Park your car in Harvard Yard, but the overwhelming majority of Americans growl out the R.

也有些地区方言的显著特点就是没有卷舌化的现象，一个典型的例子就是波士顿人把Park your car in Harvard Yard（把你的车停在哈佛校园里）说成Pahk yah cah in Hahvahd Yahd，但是绝大多数美国人的R音还是很浓重的。