keep mum

基本解释

The fact that so manyallegedly green groups are keeping mum about this merely shows that theverdant left thinks getting Democrats elected is more important thanthe environment.
那麽多自我標榜的綠色組織對此也保持沉默衹不過顯示出稚嫩的左翼思想，認爲民主黨儅選要比環境更重要。
Most firms are keeping mum about the costs, though the little publicly available information there is suggests independent development costs range from hundreds of thousands to millions of dollars.
公開可取得的極有限信息表明：獨立開發的成本從幾十萬到幾百萬不等。
We see our child roaming freely throughout the story fascinated by everything he sees, with mum along for the ride, keeping him safe at times of need.
我們可以看到孩子在他眼中的世界裡自由徜徉，他的母親在一旁靜靜地陪伴著他。

Nudging buyers toward subprime loans, or keeping mum about the risks, means more sales go through.
FORBES: Where Were The Realtors?
The craft use a number of sensors, some of which Lockheed Martin is keeping mum about.
ECONOMIST: Autonomous helicopters
Sotheby's is keeping mum about the seller, but is saying the owner is a private entity.
FORBES: Magazine Article