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1. The astronomer used a single-tube telescope to observe the stars.
这位天文学家使用了一个单筒望远镜来观察星星。
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2. The photographer took a single-tube lens to capture the beauty of nature.
这位摄影师用了一个单筒镜头来捕捉大自然的美丽。
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3. The engineer designed a single-tube pipe for the construction project.
这位工程师设计了一个单筒管道用于建设项目。