Tom and John are responsible for cleaning the class room on alternate weeks.

汤姆和约翰轮流每隔一星期便负责清洁课室。

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In a different report, they measured the rise in insulin and blood sugar levels in response to a meal before and after three weeks of alternate-day fasting.

在一份不同的报告中，他们测量到，实行三周的偶尔禁食后，饭前的胰岛素和血糖水平会增加。

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Most of the city's 50, 000 households are already on collections of household waste and recyclables on alternate weeks.

BBC: Exeter expanding fortnightly bin collections