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单语范例（未经PONS编辑处理）
This standard involves descriptions, operational tests, forcing tests, and surreptitious entry tests.
en.wikipedia.org But until the campus and its visitor center open, we'll have to be satisfied with surreptitious drone footage.
www.wired.com During construction, workmen left a trapdoor within the whale's stomach, which they would use for surreptitious cigarette breaks.
en.wikipedia.org It was political and poetical, religious and surreptitious.
en.wikipedia.org It was alleged to even be a surreptitious solipsism, whereby all that exists is one's own mind.
en.wikipedia.org