This kind of air pollution occurs frequently in spring, autumn, and is specially serious in winter season.

这种类型的空气污染在春、秋、冬季都经常发生，尤以冬季较严重。

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Prior to 1992, China had already developed two kinds of fairing, and succeeded in many launches under wind aloft conditions in winter season.

早在1992年前，中国已研制成功两种整流罩，多次在冬季高空风条件下发射成功。

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I want some bamboo and plum trees planted in the yard.I want heavy rain during summer days and brilliant sunlight in winter season, so that I can always look beyond the sky of azure blue.

我想院中几颗竹树和梅花，我要夏天多雨冬天爽亮的天气，可以看见极蓝的青天。

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David Ogrean, Executive Director of USA Hockey, gives credit to the NHL for interrupting its season so that the best players in the world can compete at the 21st Winter Games.

VOA: standard.2010.01.12

The Russian is undefeated in the winter indoor season, winning seven out of seven competitions in the Czech Republic, Russia, Germany and Slovakia.

BBC: Ivan Ukhov retains European Indoor high jump title

Ford doesn't have any concerns about her knees holding up to the rigors of playing in the WNBA in the summer on the heels of a winter season in Europe.

WSJ: Ford eyeing title in return to WNBA with Liberty

The incident, the worst ever that the industry has seen, occurred in the busy winter season when factories are working round the clock to meet springtime orders.

FORBES: Bangladesh's Burning Problem