Objective To analyze the protection efficacy of the vena cava filter from pulmonary thromboembolism and report the problems and complications after filter placement.

目的评价腔静脉滤器对肺动脉栓塞的预防效果、使用中的问题和并发症。

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By use of the theory of after filter, the problems of selecting new boundary point when several points border upon each other and symmetrical combination for outline points are analyzed.

利用后滤波的原理，对多邻接点时新边界点的选择和轮廓端点的对称合成等问题进行了分析，采用构造拟合曲线查找表进行曲线拟合的方法实现反走样。

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The rule that we previously examined is about as simple as a rule can get. It queries for only a single type of node in the AST tree and blindly reports all results remaining after filter.

我们前面所介绍的规则是最简单的一种了，它只查询ast树中一种类型的节点，并且盲目地报告所有结果。

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In early 1998, as more bombs were found, and after an abortive attempt to filter out the ammunition, the navy abandoned the beach-replenishment project, dumping the sand into the sea instead.

ECONOMIST: California��s beaches: Out to sea | The

Drug dealers were among the first to filter in to New Orleans after Hurricane Katrina, joining some who never left at all.

FORBES: Magazine Article

As I turned back onto the I-90 towards Toledo and eventually Detroit, after a nutritious burger and fries, a filter took cars onto the interstate across a lane of oncoming traffic.

BBC: The selfless America outsiders don't see