同样道理，并不是所有用户都需要的部件，如网络设备或SCSI，则通常按照基本规格留在主板上，以降低成本。
Similarly, not all users need the parts, such as network devices or SCSI, is usually to remain in accordance with the basic specifications of the motherboard in order to reduce costs.
这些零件是以大批量、高规格和降低成本的条件下生产的。
These parts are produced in large quantities with a high degree of perfection at reduced cost.
为了降低遗漏规格或特征的概率，可以在设计输入阶段使用规格检查单。
To reduce the probability of a requirement or characteristic being left out, a specification checklist(s) may be used during the design input phase.
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