They are available in either double-acting or spring-return configurations.

他们可以以双作用或弹簧返回配置。

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Each spring, thousands of walruses return to the Walrus Islands in northern Bristol Bay to feed, rest, and sometimes die.

每年春天，成千上万只海象返回到布里斯托尔湾北部的海象群岛觅食、休憩、有时死亡。

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And when game moved out of the lowlands in early spring, the expedition decided to return east rather than face possible starvation.

然后，猎物在早春迁徙出低地时，探险队决定返回东部，以免遇到可能出现的饥饿问题。

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Manager Terry Collins expects the right-hander to return for another spring training start early next week.

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And lungworts (Pulmonaria), one of the first shade-loving perennials to return each spring, have white polka dots covering their spiky green leaves.

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The orang-utans will move out in January and return in the spring.

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