From his staff he earned the sobriquet "Mumbles."

他的员工们给了他“嘟囔”的绰号。

Yuri mumbles the last of it.

最后这句Yuri喃喃道。

Say, who are you that mumbles in the dark?

说， 你是谁呀在黑暗中嘟囔?。

No one ever mumbles, stutters, or says "um..."

没有人会咕哝，结结巴巴说话，或说“um...”

And turning to me he mumbles savagely: "That cluck!"

说完他又转向我恶狠狠地咕哝道，“这个笨蛋！”