Instead of assessing the accuracy of secondary-structure assignment directly, which is not yet feasible, we compare the two assignments of secondary structures in structurally aligned positions.

• 最后一句过渡到指派二级结构的计算方法（下一段的主题)。注意“计算方法”放在句子的最后是为了强调而且和第二段的开始连接在起来。