He mumbled something to me which I did not quite catch.

他对我叽咕了几句话, 可我没太清楚。

Mr. Bosher, with his mouthful of biscuit, mumbled that it was sweetly pretty.

伯希尔先生满嘴塞着饼干，叽叽咕咕地说这极了。

As she denounced the government's policy, the crowd murmured their approval.

当她抨政府的政策, 叽叽咕咕地表示赞同。