Variable air volume systems have been widely used in various kinds of buildings due to their energy-savings, comfort, safety and good flexibility.

变风量系统因其节能、舒适、安全以及好的灵活性而被广泛应用于各类建筑物。

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Each volume in the set explores a wide range of material, explains the basic concepts of major applications of digital systems, and discusses the influences they have on everyday life.

系列中的每卷探索了广泛的材料，解释数字系统的主要应用的基本概念，并讨论了它们对日常生活的影响。

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Objects on a system could be files, file systems, volume groups, devices, and more.

系统上的对象可以是文件、文件系统、卷组、设备等。

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All of these systems take up volume and mass.

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"Not only was a large volume (11 out of 47 systems) of OPM's IT systems operating without a valid Authorization, but several of these systems are among the most critical and sensitive applications owned by the agency, " Michael Esser, OPM's assistant inspector general for audits, wrote in testimony prepared for committee.

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They are producing kits or projects in enough volume that they are trying to build systems and processes around their maker business.

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