测量学经纬仪竖盘读数系统误差
桥梁耐久性差、服务寿命短及全寿命经济性指标差等问题已成为世界性难题。
Poor durability, short service life and low economical efficiency of Bridges have become a worldwide difficult problem.
从教授的反馈和论文考试的数量这两个指标来看，精英学校的表现略差。
On two measures—professors' feedback and the number of essay exams—selective schools do slightly worse.
由于这些指标永远都是递增的，所以必须事先确定一个基准，再根据它计算出之后的差量。
Because these metrics perpetually increment, you must take a baseline before and calculate the difference afterward.
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