The rest of the clam followed by moving quickly up and down and rapidly opening and closing its shell.

蛤蚌留在沙子外面的身体部分接着开始上下移动，并且迅速的开合它的贝壳。

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The resolution (opening up a connection, pulling down content, closing the connection, and so on) also may slow down the parsing process.

解析（打开连接、下载内容、关闭连接等）也会减慢分析进程的速度。

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Solenoid operated pump control for controlled opening and closing on pump start-up and shut-down.

通过在泵开和关时电磁阀所进行的开启和关闭来操作泵控制阀。

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