微积分是数学史上的一次重大突破，因为她使连续变量可以被处理。
Calculus was a mathematical breakthrough, because it dealt with continuously varying quantities.
液压胶管加压盐浴连续硫化工艺（PLCV）是液压胶管连续化生产工艺的重大突破。
The pressured liquid continuous vulcanisation (PLCV) represents a significant breakthrough in the manufacturing process of hydraulic hose.
从2003年开始，连续两年的国家级精品课程建设，综合性学院课程门数尚未实现零突破。
But for two consecutive years since 2003, none of the courses submitted by these universities has been selected as a National Top-Course.
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