理想边界是由尺寸公差和形位公差综合形成的，它代表实际要素在满足设计要求条件下的极限状态。
An ideal boundary, which stands for the limit condition of real feature under meeting design demands, can be formed by suitable dimensional and geometrical tolerances.
理想情况下，这个系统甚至会让我们把生态系统从边界处拉回来。
Ideally, the system would even allow us to pull an ecosystem back from the borderline.
黎明时最理想的沙丘观赏时间：留在公园边界线内，等待早起的星星吧。
Dawn is ideal dune-viewing time: stay inside the park boundaries for those early starts.
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