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If Gollum had contrived to follow them , he remained unseen and unheard.
如果咕噜仍然穷追不舍, 那他的身形和动静都掩饰得很好.
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3、
They were shut away in a little room where nobody could overhear
他们被关在一个小屋里，没人能听到他们的动静。
柯林斯高阶英汉双解学习词典
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