The piston slides noiselessly up and down.
这个活塞上下活动,没有响声。
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研究
呼唤 Through the forest they crept noiselessly, Buck at the hairy man's heels; and they were alert and vigilant, the pair of them, ears twitching and moving and nostrils quivering, for the man heard and smelled as keenly as Buck.
巴

毛人后面,
森林中无声无息地潜行。毛人和巴
, 他们俩都很机灵, 耳朵竖起来转来转去, 鼻翼扇动
, 原来毛人有
和巴
一样灵敏
听觉和嗅觉。