Right In the fluid control and shut down and so on, spool orientation is important for the spool valve core and valve.

对于流体的控制和关闭等，阀芯的导向十分重要，阀芯导向用于阀芯和阀座的对中配合。

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Right In the fluid control and shut down and so on, spool orientation is important for the spool valve core and valve seat oriented toward the tie.

对于流体的控制和关闭等，阀芯的导向十分重要，阀芯导向用于阀芯和阀座的对中配合。

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A toy consisting of a flattened spool wound with string that is spun down from and reeled up to the hand by motions of the wrist.

游游拉线盘， 溜溜球由缠有细绳的扁线盘构成的玩具，通过手腕运动在手上翻转，然后收到手里。

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