This is warranted only if your code demands immediate use of the extensions.
这只有在代码要求立即使用扩展时才得到保证。
They must be ready for immediate use when fire breaks out.
它们（指灭火器）必须在发生火灾时能立即投入使用。
Have signaling equipment ready for immediate use.
准备好信号设备，供急用。
Have signaling equipment ready for immediate use.
准备好信号设备，供急用。
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