There are two one-way valves for water inlet and outlet, which cooperates with floating ball in water tank to play switch role.

进出水口有二个单向阀，水箱内置有浮球装置，该装置和二个单向阀共同起开关作用；

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They dynamically switch their role from internal to external, and vice versa, in response to changes in the organizational control of resources and activities of consumption service.

它们动态地将其角色从内部切换到外部，或反之亦然，以响应使用服务的资源和活动的组织控制更改。

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Specifying that a process in role mgr_r may switch to a valid context in role cashier_r. But there is no line.

指定角色mgr_r中的进程可以切换到角色cashier_r中的有效上下文。

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Back at the center, Moore will switch out of her role as chauffeur and play the various parts of administrator, counselor, bookkeeper, teacher and diaper-changer.

FORBES: Child Care Director Is Also Diaper-Changer in Chief

Former Wales scrum-half Rob Howley has been appointed part-time assistant to coach Warren Gatland, but will switch to a full-time role in May.

BBC: Wales appoint Edwards and Howley

Andy Rubin, head of Android at Google, is leaving that job to take on another unspecified role at the company in a surprise management switch up, Google CEO Larry Page announced in a blog post today.

FORBES: Android Chief Andy Rubin Switching Roles At Google In Surprise Management Move