The computer model finds that mid-frequency sonar is mostly filtered out for the whales, while the higher frequencies the animals use for hunting appear to be unimpeded by sonar.

电脑模型表明，突吻鲸能过滤掉声纳大部分的中频声波，而声纳也不会影响这些鲸鱼用来捕猎的高频声波。

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Diamond-like carbon DLC thin films were deposited onto si 100 and high speed steel substrates by mid-frequency magnetron sputtering system SP0806AS, Beijing Power tech Co.

采用SP0806AS中频磁控溅射镀膜机，在硅(100)和高速钢基体上，采用双石墨靶在不同功率下沉积了类金刚石薄膜。

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Full bridge topology was used in the main circuit, IGBT was used as power switching device, and micro-crystal core was used in mid-frequency transformer.

其主电路采用全桥式拓扑结构，以IGBT管为功率开关器件，中频变压器使用微晶磁心。

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And because fancy cars don't rent with the same frequency as mid-market ones, travelers can often find deals online, both with established agencies and lesser-known firms seeking a foothold in the market.

WSJ: The Rise of the Rent-a-Porsche

The slow decline in tornado death frequency from the mid 1920s through the early 1950s was greatly accelerated by the deployment of weather radar in the 1950s and 60s.

FORBES: The Great Tornadoes Of 2011 Put In Perspective

Under the hood, PLAYBAR gets its punch from nine individually amplified speakers: six mid-woofers to deliver deep, rich low-frequency sounds, and three tweeters for crystal clear high-frequency detail.

ENGADGET: Sonos Playbar: a home theater soundbar that wirelessly streams music for $699, we go hands- (and ears) on