1、无声地
... noiseless 无声的 noiselessly 无声地 noisy 吵闹的 ...
2、静静地
...silently 沉默地noiselessly 静静地dumbly 默默地 ...
3、一声不响
弦外之响 reading between the lines; implied meaning 一声不响 noiselessly; to keep totally silent 应用程式影响遥测 Application Impact Telemetry ..
4、悄无声息
... 憩息处 rest area 悄无声息 quietly; noiselessly 确认讯息 confirmation message ...