In this case, you might want to filter closed work items.
在本例中，您可能想要筛选关闭的工作项。
So far the site is mostly a hang-out for Silicon Valley insiders (it's in closed beta) but as more and more of the rest of us filter in - hopefully the excellent user-experience can scale.
目前为止，这个网站主要是硅谷内部的人员访问(现在正在内部测试)不过当越来越多的其他人的加入之后——出色的用户体验很有希望能够扩大。
The effectiveness of an air tight ventilatory dust exhaustive system with closed circuit cycle and pulse fissure blow filter bag was studied.
本课题采用的闭路循环式密闭通风除尘系统，使用环隙喷吹脉冲滤袋除尘器。
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