On cold winter days, we can stay warm with battery- operated gloves and socks, and specially made coats and Jackets.

2017年12月四级真题（第二套）听力 Section C

The rock salt mine is one of three operated by Cargill with the other two in Louisiana and Ohio.

2016年12月四级真题（第一套）听力 Section A

Recently, Sanchez bought a hand operated tool which pulls out weeds and loosen soil.

2019年12月六级真题（第二套）听力 Section B

since then, NASA, the National Reconnaissance Office and even Boeing have all launched and operated CubeSats.

2019年6月六级真题（第三套）阅读 Section B

The oldest continuously operated commercial hydro-electric plant in the United States is on New York's Hudson river, and it went into commercial service in 1898.

2015年12月六级真题（第一套）阅读 Section B

Twenty years ago, the Urban Land Institute defined the two types of cities that dominated the US landscape: smaller cities that operated around standard 9-5 business hours and large metropolitan areas that ran all 24 hours of the day.

2017年12月六级真题（第一套）阅读 Section C

While that may make suborbital travel safer, it would add significant cost and complexity to an emerging industry that has until now operated largely as the playground of billionaires and dreamy engineers.

2015年12月六级真题（第二套）阅读 Section C