Usually start in December each year until the following year in April.

通常从每年的十二月份一直到第二年的四月份。

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Each year in April, swans and other rare birds return from the south to live and breed there.

每年四月，天鹅和其他稀有禽类都会从南方飞回这里生活繁殖。

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Retail sales increased by 14.8% year on year in April, maintaining the recent trend of impressive expansion.

四月的零售额比去年同期增加了14.8%，维持了近来令人印象深刻的增长趋势。

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After rising steadily for more than a year, the index of leading economic indicators actually slipped by .1 percent in April, according to a private research group.

VOA: standard.2010.05.20

As soon as the Civil War broke out and Lincoln called for volunteers in late April 1861, Uriah Parmelee dropped out of his Junior year at Yale and he joined the first regiment he could get into.

内战爆发时,林肯在1861年四月末召集志愿兵,大三的乌利亚从耶鲁辍学,好不容易入了伍

耶鲁公开课 - 美国内战与重建课程节选

It happens in, I think, April and last year we had Snoop Dogg come perform, so that was really cool.

时间就是在四月份。去年，史努普·道格还来我们的音乐会表演，场面非常火爆。

校园生活 - SpeakingMax英语口语达人

But household spending rose 1.5% on year in April, lower than a 2.8% rise forecast by economists.

WSJ: Japan Industrial Production Rises 1.7%

Both supply and demand of small business loans dropped for the first time this year in April.

FORBES: Small Business Lending Drops In April

Earlier this year in April, a pile of post has mysteriously reappeared nearly two years after being sent.

BBC: NEWS | UK | Wales | Christmas mail dumped in woods