开发人员编写代码来通过API访问设备，但是一些API目前不可用，比如一个指针api、一个视频API或一个套接字api。
Developers write code to access the device through its APIs, but some APIs are not yet available, such as a compass API, a video API, or a sockets API.
这就意味着在comet流样式通信持续期间，从客户端设备到后端服务器的每个系统上都至少有一个连接处于不可用状态。
This means that during the duration of a Comet streaming style communication, at least one connection is tied up on each system from the client device to the backend server.
这个新的设计被用于数据中心冷却技术的补充，或者是当这些设备位于新鲜空气不可用的情况下。
The new design could be used as supplemental cooling in a data center using free cooling, or in facilities located in areas where fresh air cooling isn't feasible.
好吧，我们找到了原因，原来指南针功能是不可用的设备。因此设置为要求：假应该做的伎俩。
Okay we found out why, turned out it was the compass feature that was not available on those devices. So setting it as required:false should do the trick.
任何读取错误就像一个'不可用'警惕可能表明在内存设备问题，读卡机或驱动程序。
Any read errors like a 'Not Available' alert could indicate problems in the memory device, the card reader or the driver.
我们可以帮助你更多的如果你提供更多细节，不可用的设备。
We may be able to help you more if you provide more details about that unavailable device.
在实际工程应用中，编队卫星由于任务的要求使得部分测量设备(例如，激光设备)不可用，这就造成系统的观测性下降。
In practical applications, some measurement equipment (such as laser) of satellite formation flying can not be used for mission requirements, which led to the decline in observability.
一个VFAT必须的设备或资源不存在，或者不可用。
A device or resource required by VFAT is not present, or is unavailable.
好吧，我们找到了原因，原来指南针功能是不可用的设备。
Okay we found out why, turned out it was the compass feature that was not available on those devices.
注意到在SD记忆卡或设备的设备，并将其存储截图(如sd卡不可用)。
Takes a screenshot of your device and stores it on the sd card or device memory (if sd card is not available).
注意到在SD记忆卡或设备的设备，并将其存储截图(如sd卡不可用)。
Takes a screenshot of your device and stores it on the sd card or device memory (if sd card is not available).
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