1. Calculus is a difficult course for most of the college students. 微积分对大部分学生来说是一门很难的课程。
2. In the refutation tree of predicate calculus, the proved conjunctive formula. 在谓词演算的反驳树中，被证明的合式公式。
3. Calculus is all about continuums — rates of change, areas under curves, volumes of solids. 微积分都是关于连续统的--变化的比率，曲线的面积，立体的体积。
英英解释
n.
1. a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body
2. an incrustation that forms on the teeth and gums
3. the branch of mathematics that is concerned with limits and with the differentiation and integration
