The operation principle and oil distributing rule are introduced by expansion method. The features of closed and opened oil circuit are discussed briefly.

本文用展开法介绍其工作原理与配油关系，并扼要讨论闭式与开式油路的特点。

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The paper introduces the configuration of system and the work principle of the closed and opened loop control in the pitching of collimation prism of the submarine periscope.

介绍潜艇潜望镜瞄准棱镜俯仰的闭环控制与开环控制的组成及其工作原理。

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The travelling valve of the pump is designed to be closed and opened forcibly, and the pump plunger adopts equal-diameter bare pipe with a floating structure to prevent gas lock and sand sticking.

这种抽油泵柱塞游动阀采用机械强制开启和关闭的结构，柱塞为等径光管、浮动结构，可防止发生气锁游动阀、阀球关闭滞后、砂卡柱塞现象。

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He did not speak as the trial opened, and he kept his eyes mostly closed.

VOA: standard.2009.11.30

'" Similar story with "No Ordinary Family": "That door closed and opened the door for Vince Savino.

WSJ: Michael Chiklis | Heavy Opportunities | A Cultural Conversation by Joanne Kaufman

Same-store sales growth is an important measure to gauge the performance of a restaurant chain since it includes only the restaurants opened for at least a year and excludes the newly opened (and closed) restaurants, sales of which might be unusually low or high.

FORBES: Starbucks Venti Sized Results Show Strength In U.S. Business

Of the 2, 500 private schools, 92 closed and only 64 opened last year.

ECONOMIST: Private education