A breakthrough is an important development or achievement.
近义词
development , achievement , advance
双语例句
例： The company looks poised to make a significant breakthrough in China.
该公司看上去稳将在中国实现一次重大突破。
例： The breakthrough came hours before a U.N. deadline.
重大突破出现在联合国的最后期限到来前的几小时。