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可构成合成词：
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sound wave 声波
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sound barrier 音障
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sound effects 音响效果
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sound recording 录音
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sound track 声道
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sound proof 隔音的
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常可作可数名词：
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I heard a strange sound in the house．我听见屋里有奇怪的声音。
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The door was open; sounds came from the kitchen．门开着，声音来自厨房。
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There was a sound of footsteps on the staircase．楼梯上有脚步声。
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noise也指声音，但多指噪音：
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I don’t like noise (noises)．我不喜欢嘈杂的声音。
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I heard a noise outside the window．我听见窗外有嘈杂的声音。
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Stop the noise！不要这样吵！
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The noise of traffic kept me awake．车辆的噪音使我无法入睡。
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836 souvenir—keepsake—memento
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souvenir表示“纪念品”（读作/ˌsuːvəˈniə, ˈsuːvəniə/）：
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The local shopkeepers sell souvenirs to the tourists．当地商店售卖纪念品给旅游者。
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My uncle left me his watch as a souvenir．我叔叔留下他的表作纪念。
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keepsake也表示“纪念品”：
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Mary’s boyfriend gave her a bracelet as a keepsake．玛丽的男朋友送给她一只手镯作纪念品。
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She kept the partially torn photograph as a keepsake of her trip．她保存了一张部分撕破的相片作为这次旅行的纪念品。
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memento /miˈmentəu/也表示“纪念品”：
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My host gave me a small gift as a memento of my trip to France．主人给了我一件小礼物作为我法国之行的纪念品。
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