闷声闷气 meaning in Chinese

in a muffled voice

A few mortar shells were landing somewhere with a flat thudding sound .
不知哪里落了几颗迫击炮弹，闷声闷气地轰轰几响。
The sound changed, not into the silence which had preceded the arrival of these stunning news, but into stifled mutterings .
群众的声音变了，不是回到这骇人听闻的消息下达之前的沉默，而是变成闷声闷气的低语。
Towards midday , a girl heard a muffled cry coming from behind one of the walls
快到中午的时候，一个女售货员听见从一堵墙里传出一种闷声闷气的叫声。
At last the guard returned ; once more i was stowed away in the coach , my protector mounted his own seat , sounded the afternoon came on wet and somewhat misty : as it waned into dusk , i began to feel that we were getting very far indeed from gateshead : we ceased to pass through towns ; the country changed ; great grey hills heaved up round the horizon : as twilight deepened , we descended a valley , dark with wood , and long after night had overclouded the prospect , i heard a wild wind rushing amongst trees
我在房间里来回走了很久，心里很不自在，害怕有人会进来把我拐走。我相信确有拐子，他们所干的勾当常常出现在贝茜火炉旁所讲的故事中。护车人终于回来了，我再次被塞进马车，我的保护人登上座位，吹起了闷声闷气的号角，车子一阵丁当，驶过了镇的“石子街” 。