every 2 year?every 2 years?each 后接复数单数?

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every 2 year?every 2 years?each 后接复数单数?
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every 2 year?every 2 years?each 后接复数单数?
every 2 year?every 2 years?
each 后接复数单数?

every 2 year?every 2 years?each 后接复数单数?
every 2 years
类似的还有,every 2 seconds,every 2 minutes,every 2 hours等.

单数