一般都备有铰链着的玻璃盖面，以把稿件夹平。有些更可以换上透明片架，在后面打灯照明。
Frequently it has a hinged glass cover to hold copy flat, and may have a removable section in which a transparency holder can be positioned for back-lighting illumination.
一架直升机在茂密丛林中的一片空地着陆了。
除了成架的书籍，书店里几乎一片漆黑。
The bookstore is almost completely dark, except for the shelves of books.
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