Provisions on the specific scope of state secrets and scope of each classification level shall be published within a certain range and adjusted in light of changes of situations.
国家秘密及其密级的具体范围的规定，应当在有关范围内公布，并根据情况变化及时调整。
The testing content and procedure on detection range with a certain new model low light level observation device are described.
叙述国产某新型微光观察仪探测距离的测试内容和方法，并得出具有一定参考价值的结论。
Boiler is an equipment of produce steam, to keep the water level of the boiler drum within a certain range is very important.
锅炉是生产蒸汽的设备，保持锅炉汽包内的水位在一定范围内是非常重要的。
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