理论上来说，游客每年仅有一次机会来参观这个坐落在一个军事单位中的直升机博物馆。
Theoretically, visitors can see this helicopter museum, placed in a military unit, only once a year.
美国每年有100亿农场动物专门供人食用，它们被看成是一个个生产单位，而不是有情的众生。
Viewed as production units rather than living beings with feelings, ten billion farm animals are exploited specifically for food in the United Statesevery year.
平均一个美国人每年要受到360毫雷姆(毫雷姆：核辐射量单位)的辐射，其中300毫雷姆来自自然界，60来自人类活动。
The average American receives 360 millirems of radiation each year, 300 from natural sources and 60 from man-made activities. (a rem is a unit of radiation exposure.)
而且该公司现在已经与阿曼石油开发公司签署了7兆瓦工厂的协议- - -一个16000平方米的温室，每年大约提供570亿百万英(制)热单位(BTU)的蒸汽。
And the company has now signed a deal with Petroleum Development Oman for 7 megawatts of plant-a 16, 000-square-metre greenhouse providing some 57 billion btu of steam a year.
一个舰载飞行联队每年到法隆进行舰载飞行联队训练的次数达到四次或者是更多，为期四周的课程使得联队能够为其作为一个战斗单位进行部署做好准备。
A carrier air wing comes to Fallon four or more times a year for carrier air wing training, a four-week course to prepare the wing for its first deployment as a fighting unit.
一个舰载飞行联队每年到法隆进行舰载飞行联队训练的次数达到四次或者是更多，为期四周的课程使得联队能够为其作为一个战斗单位进行部署做好准备。
A carrier air wing comes to Fallon four or more times a year for carrier air wing training, a four-week course to prepare the wing for its first deployment as a fighting unit.
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