So, the study of characteristics of port plate pairs has great guiding significance and practical significance to the development and design of multi-action constant axial piston pump.

因此开展配流副特性研究，对开发设计这种多作用恒流轴向柱塞泵具有十分重要的指导意义和现实意义。

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All clocks must have a regular, constant or repetitive process or action to mark off equal increments of time.

所有时钟都必须有一个均匀、恒定或重复的划分时间等量增加的过程或动作。

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Your body has a constant demand for energy and USES the calories from food to keep functioning. Energy from calories fuels your every action, from fidgeting to marathon running.

人的身体不断的需求能量，并从食物中获取卡路里以维持身体各项机能，让你能行走坐卧，甚至参加马拉松长跑。

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Almunia was the keeper in constant action, and he performed heroics again after 28 minutes to keep out Ronaldo's header from an inviting cross by the industrious Tevez.

BBC: Man Utd 1-0 Arsenal

We were right in the middle of the action and there was a constant concern that the elephants would come charging through our vehicle.

CNN: 'Earth' takes viewers on 'breathtaking' global journey

The NFL is shifting from a league where coaches dictate most of the action, to one of constant improvisation, where even rookies, such as Washington Redskins quarterback Robert Griffin III, are taking on an unprecedented level of responsibility for managing games.

WSJ: In the NFL, Power Shifts to the Players