电梯完全是原装的，内外机门都采用手动上下开关式密门。
The elevator is entirely original. It utilizes manual vertical doors for both the inner and outer landing doors.
上下快速拨动电灯开关看看是否来电了。
要确保用于服务器提供者和请求者的资源在容量随需求上下波动时不会被浪费，需要创建一个具有耦合开关的Web服务以配合SaaS应用程序。
To ensure that resources for service providers and requesters are not wasted when capacity goes up or down on demand, create a Web service with a coupling switch to supplement SaaS applications.
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