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1·I could hear him mumbling to himself.

我听到他在喃喃自语。《牛津词典》

2·What are you mumbling to yourself?

你在嘀咕什么？

3·He closed his eyes, fell to mumbling, and presently was silent.

他闭上眼睛，喃喃自语起来，不一会儿就沉默了。

4·Do you think that people are always mumbling?

你是否觉得人们总是含糊不清地说话？

5·Stop mumbling! I can't understand what you say.

不要讲话隐约不清的，我听不懂你在说什么。

6·No wonder our bus driver is mumbling to himself.

难怪我们的公车司机一直喃喃自语。

7·He was giving a speech, yet he was mumbling away to himself.

他在发言，可却是在喃喃自语。

8·If the answer is mumbling, the Americans will assume the worst.

如果答案模棱两可，美国人就会设想最糟糕的情况。

9·You'll have to speak up, young man; there's no use mumbling. '.

你应当说大声点，年轻人，喃喃低语是没用的。

10·She bumped into the furniture and kept mumbling about the guests.

她撞到了家具上，嘴里还不断咕咕哝哝议论客人。