I've been thinking about this a lot the past couple of weeks, because I've taken the opportunity, for the first time in many years, to play tennis nearly every day.

过去几周我一直在思考这个问题，因为这么多年来我第一次有机会几乎天天打网球。

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Since World Cup of the first rugger was held in New Zealand 1987, this match every other is held 4 years, this year hold time to come from September 9 on October 23.

自1987年第一届橄榄球世界杯在新西兰举办以来，这项赛事每隔4年举办一次，今年的举办时间从9月9日至10月23日。

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For many involved in so-called minority sports in smaller nations, this is the one time every four years that they get the chance to assert their sporting identity and independence in front of a world television audience.

BBC: Scotland slow to embrace Games

Only two voters turned out this time for every three who voted in the corresponding elections four years ago.

ECONOMIST: Local elections

The TIMSS is produced every four years while the PIRLS is published every five years, but this is the first time Northern Ireland has taken part in the test results study.

BBC: Northern Ireland is 'best in Europe' at primary maths