The new soldier muttered about the food.

那位新士兵咕地抱怨吃得不好。

He mumbled a few words and left.

他咕句便走。

He mumbled sth. to me but I could not hear what he said.

他对我咕句，可是我没听清他说什么。

I heard a mutter of discontent.

我听到有人小声咕着表示不满。

She muttered away in the dream.

她在梦咕咕地抱怨。

Loretta gave a cluck of impatience.

洛雷塔发出不耐烦咕声。

John stamped off, muttering.

约翰嘴里咕着迈着步走。

In March he goes on a survival course and learns about the “umbles”: as hypothermia sets in you mumble, fumble, grumble, stumble, then finally tumble.

三月，开始野外生存训练，懂得寒冷下嘴、是什么样：低温开始，咕，摸爬，嘟囔，踉跄，终于仆倒在地。