Project constraints in resources and time invariably force a focus down to primary data elements and domains.

由于项目受到资源和时间的约束，该分析常常集中于主要的数据元素和域。

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The movement of the bell is forward and back, not up and down, with the goal to project the force forward and to resist by grounding into your feet.

壶铃的运动是前后方向的，而非上下，要实现此目的需要将力向前延伸，并通过双脚抓地来抵抗向前的拉力。

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