In spring, caterpillars time their emergence to coincide with the bud burst of trees; birds start nesting when they can feed those newly emerged caterpillars to their fledglings.

春天，毛毛虫的出现时间和树木的萌芽一致；鸟儿开始筑巢的时间要跟毛虫出现的时间吻合，用来哺育幼鸟。

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Then a spring burst and it stopped singing in the middle of its song.

接着一条弹簧断裂，这只机械鸟歌唱到一半就停了。

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The faith of freedom floated in the London's air and burst into blossom like spring flowers.

自由的信念在整个伦敦的上空飞扬，在人们的心中像春天的花朵一样盛开。

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The Internet bubble had burst in the spring of 2000, and we were in the midst of a bear market in stocks.

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The Chinese believed that the rising of Arcturus, the fourth-brightest star in the sky, caused spring to burst forth, while the Egyptians thought that the appearance of Sirius, the brightest star in the sky, brought about the annual flooding of the Nile.

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The abrupt reversal of mood recalls both 2010 and 2011, when a promising burst of growth in the early months petered out in spring and summer.

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