The next level down has more specific categories.
下一个级别包含更具体的类别。
Figure 2 illustrates how requirements are traced from the top level down.
图2阐述了从高层次到低层次需求是如何被追踪的。
This is a good method to keep the cholesterol level down.
这是个保持低胆固醇的好方法。
This is a good method to keep the cholesterol level down.
这是个保持低胆固醇的好方法。
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