在正常操作条件下，镇静钢中没有气泡，组织均匀致密；
Under normal operating conditions, no bubble calm steel, microstructure;
大多数情况下，此软件包并不是操作系统正常工作的必要条件。
This software package is not a requirement for your operating system to work properly.
它并不是操作系统正常工作的必要条件。
It is not a requirement for your operating system to work properly.
它并不是操作系统正常工作的必要条件。
It is not a requirement for your operating system to work properly.
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