Most people, at least once per day, will lose concentration on not biting their nails.

大多数人一天中至少一次会无意识地咬指甲。

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Granted Powers: Once per day, an opponent you designate may not add its appropriate ability modifier to a single attack, skill check, spell, spell-like ability.

神授领域：每天一次，你能够指定你的一个敌人，他将在一次攻击、技能检定、法术、类法术能力中无法获得相应的属性加值。

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In another recent cancer prevention study that found no excess heart risk in Celebrex users, patients only took Celebrex once per day, not twice as in the NCI study, potentially reducing any damaging effects to the heart from Cox-2 inhibition.

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For example, 42% of female online gamers socialize with friends and family in person at least once per day versus 31% of females who do not play online games.

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