Many environmental agencies organize events based on different themes each year.

每年，许多环境机构会组织各种主题活动。

Then, you pick a base year. It can be any year you want.

然后，选出基准年，它可能是你想要的任何一年。

You divide the basket cost of each year, by the basket cost in the base year and multiply it times 100.

你把各年的篮子成本除以基准年的篮子成本，再乘以100。

The CPI allows us to adjust for inflation by leveling the playing field and putting all the earnings in the same base year prices.

CPI允许我们调整通货膨胀，方法是调整竞争环境并将所有收益都放到相同的基准年价格中。

Iranian officials say they've simply delayed publishing new numbers because they're changing the base year from which the data is calculated.

伊朗官员表示， 他们只是推迟发布新数据， 因为他们正在改变计算数据的基准年。