It's the middle of spring and usually on the 20 or 21 of March every year.

它是在春天中期，通常在每年的三月二十或者二十一号。

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Smack in the middle of the blazing Chihuahuan Desert, a snorkeler scans the bottom of a spring-fed pool for aquatic life.

在灼热的奇瓦瓦沙漠中心，一名潜水员在生机盎然的池塘下搜索水生物。

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The news might seem welcome in the middle of a long, cold winter: Scientists have shown that the start of spring has moved almost two days earlier in the last 50 years.

科学家证明：过去五十年，春天的到来提前了近两天。在漫长寒冷的冬季，这则消息听起来似乎令人愉快。

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NDCWales is also in the middle of a spring tour celebrating its 30th birthday.

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In fact, it is no exaggeration to point out that the Venezuelan drama should be as great a concern as the elections in the young democracies of the Middle East that emerged in the aftermath of the Arab spring.

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Despite it being the middle of April, that spring was exceptionally cold and the waterfalls that streak the mountains were frozen over.

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