Adventurer: Ok. Here is Lake Itasca, the true source of the Mississippi.

探险者：好了。这就是伊塔斯卡湖，密西西比。

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Indeed, last year, Knowles Acoustics of Itasca, Illinois, which has been making MEMS microphones since 2003, became the first manufacturer to have shipped a billion of the devices.

事实上，伊利诺伊州伊塔斯加的楼氏声学，这家从2003年起制造MEMS麦克风的公司，在去年成为第一家出货量突破十亿大关的制造商。

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In addition to its Winnebago brand, the company also sells RVs under the Itasca and Rialta brands.

FORBES

The way GoGo in-flight WiFi works is that the Itasca, Ill.

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Indeed, last year, Knowles Acoustics of Itasca, Illinois, which has been making MEMS microphones since 2003, became the first manufacturer to have shipped a billion of the devices.

ECONOMIST: Noise-cancelling technology