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1. The manual ringer is used to manually pump the water from the well.
手动泵用于手动从井中抽水。
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2. The manual ringer is a crucial tool for maintaining the proper pressure in the system.
手动泵是维持系统正常压力的关键工具。
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3. During emergencies, the manual ringer can be used to quickly fill the tank with air.
在紧急情况下，手动泵可以用来快速为油箱充气。