方程: [数学] equation 短语和例子三次方程 cubic equation; 高次方程 equation of higher degree; 线性方程 linear equation; 把方程式简化成 ... reduce the equation to ...; 物态方程 equation of state; 化学方程 chemical equation
观测: observe; observation; viewing 短语和例子观测气象 make weather observations; 对 ... 作仔细的观测 make a careful observation of ...; 观测天体 take an observation; 观测报告 observation report; 观测点 observation point;
