National Volunteer Week started in 1974 and is held every April.

全国志愿者周始于1974年，每年4月举行。

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Farmers and farm animal breeders would bring their animals to market every April to show, buy and trade.

每年4月，农民和畜牧者都会把他们的动物带到市场上展示、购买和交易。

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Every April, there is a special day in China.

每年四月，在中国有一个特殊的日子。

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Every April Fools' Day, tech companies big and small roll out carefully constructed jokes.

CNN: Heather Kelly,

Every April 1--yes, April Fools' Day--highly educated foreigners with corporate sponsors file for 65, 000 H-1B visas.

FORBES: Magazine Article

Well worth a visit, the estate closes after the Christmas holidays and reopens to the public every April.

BBC: The Great Gatsby��s Gold Coast