以下为句子列表：
英文: On each card a watch-glass is placed.
中文: 在每一张卡片上，放一个玻璃罩。
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英文: Then after some hours, we take away the watch-glass of syrup which was on the blue card and put an empty one in its place.
中文: 几个小时之后，我们把蓝色卡片上有糖浆的玻璃罩拿走，换上一块空的玻璃罩。
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