名词
中文翻译：封面纸
同义词：
['cover slip', 'cover sheet', 'bookmark']
例句：
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1.She carefully placed her book on the table and picked up a cover-slip to mark the spot where she had finished reading.
她小心地把书放在桌子上，拿起一个书签来标记她已经读完的地方。
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2. The librarian gave me a cover-slip with a note that said it was for a special event at the museum.
图书馆员给了我一个书签，上面有一张便条说这是为博物馆的一个特殊活动准备的。
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3. He used his cover-slip to hide the evidence of his crime before he could be caught.
他用书签来隐藏犯罪的证据，以免被抓到。