breakthrough noun
ADJ. big, crucial, great, historic, important, major, real, significant | diplomatic, medical, political, scientific, technological
VERB + BREAKTHROUGH be, represent | achieve, make We have achieved a real breakthrough in the search for peace.
BREAKTHROUGH + VERB come, happen The crucial breakthrough came almost by accident.
PREP. ~ for The new deal represents a major breakthrough for the company. | ~ in a significant breakthrough in computer design
You can also check other dicts: breakthrough (English, 中文解释 ), wordnet sense, Collins Definition