大多数情况下，排水孔都穿过过滤带和底导规。

Most often the drainage holes run through both the filter belt and the bottom guides.

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对于带变量的sql语句，优化器会使用一个默认过滤因子在绑定时确定最佳访问路径。

For SQL statements with variables, the optimizer USES a default filter factor to determine the best access path at bind time.

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接待她的主人举行了节日庆典，然后，带她看了水坝——八英尺高的沙和混凝土结构，圈住并过滤能够全年供应的饮用水。

Her hosts held a festive celebration, then showed her the dam, an eight-foot-high sand-and-concrete structure that traps and filters water so that it's available and drinkable year-round.

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