美国东部的气温夏冬相差非常大，夏天通常很热，冬天则很冷。

In the eastern part of the United States, summer temperatures are very different from winter temperatures. Summers are usually hot, and winters are usually cold.

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对各工厂夏冬两季各工种以及各工作区域的空气粉尘平均浓度，进行工种浓度和区域浓度、季节和工厂之间的比较分析。

The statistic analysis was made for the relationships of the different dust concentrations of several personal job titles and relevant work fields, of different seasons, and of different factories.

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此次演唱会分为“春、夏、秋、冬、重生”五个部分，用蝴蝶、落叶、飘雪、冰川、星星等呈现四季变化。

The concert was divided into 5 parts: spring, summer, autumn, winter, and rebirth, using butterflies, fallen leaves, snow, glacier and stars to express the changing seasons.

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