Cost savings because only the filter is changed, not the entire hood.

节省成本，只需更换滤网，而非整个系统。

youdao

The hood contains a HEPA filter that removes more than 99.97 percent of submicron particles such as anthrax, smallpox, and radioactive particles.

这种救生罩带有一个HEPA过滤器，它能过滤超过99.97%的细微颗粒，如炭疽，天花和放射性粒子。

youdao

Air of kitchen and diesel generator room is exhausted by filter-type extraction hood, which is laid on the roof of the building.

厨房及柴油发电机房排风采用过滤型排气罩，且屋顶排放。

youdao

Rounding out the specs are optical image stabilization (MEGA OIS), intelligent ISO, AF tracking, face detection, HDMI output, and intelligent scene selector with Venus Engine HD image processing and a Supersonic Wave Filter dust reduction system under the hood.

ENGADGET: Panasonic's Lumix G1: world's first micro Four Thirds camera