Men in the top third based on their calcium intake were getting nearly 2,000 milligrams a day, on average, compared to about 1,000 milligrams for men in the bottom third.
排在前三位的男士，他们平均每天要大概摄入2000毫克的钙质，但与之相比，排在最后三名的男士每天却只摄入1000毫克而已。
Men in the top third based on their calcium intake were getting nearly 2, 000 milligrams a day, on average, compared to about 1, 000 milligrams for men in the bottom third.
排在前三位的男士，他们平均每天要大概摄入2000毫克的钙质，但与之相比，排在最后三名的男士每天却只摄入1000毫克而已。
When the piston reaches the bottom of the intake stroke, the intake valve closes, trapping the air-fuel mixture in the cylinder.
当活塞到达进气行程的下止点时，随着空气燃油的混合气进入气缸，进气门关闭。
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