而极限运动的兴起，正好满足了人类的这一需求。
The rise of extreme sports, just to satisfy this demand of mankind.
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.
试验结果表明，部分预应力陶粒砼叠合连续板跨中取用较低的预应力度，不仅能满足正常使用极限状态的要求，而且具有较好的延性。
The test results show that the continuous composite slab with lower level of prestressing can meet the requirement of ultimate state under normal serviceability and has better ductility.
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