While the potential for physical hazards in Antarctica is high, Precious says social dynamics can prove more problematic. When relationships break down, the fallout can be hard to rectify, and hard to control, he says.
The algorithm walks the tree recursively. At each node, it checks: does this node's bounding box overlap with the query rectangle? If not, the entire subtree gets pruned (skipped). If it does overlap, it tests the node's points against the query and recurses into the children.，详情可参考heLLoword翻译官方下载
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It remains unclear whether the jobs slowdown is actually due solely or even mostly to technological change.
"Every box has a surprise," Machin said as she unwrapped perhaps the most bizarre item here, thought to be from the 19th Century: a set of lower gold dentures found at St Mary's Old Church in Stoke Mandeville.