问题如下：
One-, two-, and three-year swap rates where payments are exchanged semiannually are 3%, 3.4%, and 3.7%. Explain how you would use this data to determine one-, two-, and three-year spot rates.
选项：
解释：
The three swap rates define par yield bonds. One, two, and three-year bonds, which pay coupons semi-annually at the rate of 3%, 3.4%, and 3.7% selling for par. These can be used to imply spot rates.
老师您好，这道题的原理我大概是可以理解的。在实际计算的时候，是不是缺少0.5年期的spot rate（或者是swap rate ）以及1.5 和2.5年期的spot rate呢 ？
