In the fall of the year the short days and long nights cause the "clocks" in migratory birds to undergo a kind of "winding" in preparation for their spring return and breeding.
每年秋季，短暂的白昼和长时间的黑夜令候鸟身体里的“时钟”经历某种转变，为它们春天的返回和繁殖做准备。
Quarter turn, double acting and spring return type with a totally enclosed design and no external moving linkages.
四分之一转，双动和弹簧回位类型，具有全封闭结构，没有外部活动连接。
Represents a spring return (break). Circuit can be specified as open or closed.
表示弹簧复位（断开）。可指定电路为断开或接通。
Several control handle configurations are available including spring return to center position, and friction hold which keeps the handle at any position desired.
可以提供几种手控配置，包括中心位置的弹力恢复以及保持手柄在某一特定位置所需的摩擦力。
The Hytork actuator is available in aluminum or with a protective Fluoropolymer coating and can be double acting or spring return.
Hytork执行器采用铝外壳并可选氟聚合物保护涂层，能提供双作用和弹簧复位。
The Hytork actuator is available in aluminum or with a protective Fluoropolymer coating and can be double acting or spring return.
Hytork执行器采用铝外壳并可选氟聚合物保护涂层，能提供双作用和弹簧复位。
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