One rule is that only 100 people at a time can visit the island.

其中一条规定是，这座岛屿一次只能接待100人。

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The “Rule of One” states that you install one new goal at a time.

这个理论注重的是一次你只确定一个新的目标。

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They follow the "one day at a time" rule until a healthier path becomes established.

他们遵循“一次一天”的规则，直到确定走向更健康的道路。

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The constitution, enacted in January 2012, replaced one drafted in 1989, at a time when the country was emerging from 40 years of Communist rule.

BBC: Hungary backtracks in row with EU over constitution