中文：

年利率是指在一年的时间内所产生的利息与本金的比率。简单来说，年利率就是用来衡量一个投资项目或者借款人在一年时间内所获得的投资回报率或者借款成本。

年利率的大小对于投资者和借款人来说是非常重要的。如果一个投资项目的年利率较高，那么投资者可以获得更高的投资回报，但同时也承担着更高的风险。相反，如果一个借款人的年利率较高，那么他需要支付更高的借款成本，但同时也获得了更大的资金流动性。

在金融市场上，年利率通常被用来作为衡量投资风险和收益的重要指标。不同的投资品种和借款期限通常会有不同的年利率。例如，银行的存款年利率通常比较低，而股票和债券市场的年利率则根据不同的风险等级有着不同的收益率。

英文：

Annual interest rate refers to the ratio of interest generated within one year to the principal. In simple terms, the annual interest rate is used to measure the investment return rate or borrowing cost of an investment project or borrower within one year.

The size of the annual interest rate is very important for investors and borrowers. If an investment project has a higher annual interest rate, then investors can obtain higher investment returns, but also bear higher risks. Conversely, if a borrower's annual interest rate is higher, then he needs to pay higher borrowing costs, but also obtains greater liquidity of funds.

In the financial market, the annual interest rate is usually used as an important indicator to measure investment risk and return. Different investment varieties and borrowing periods usually have different annual interest rates. For example, the annual interest rate of bank deposits is usually relatively low, while the stock and bond markets have different yields based on different risk levels.