突破用英语是breakthrough。
解释：
breakthrough 英[?bre?kθru:] 美[?brek?θru]
n. 突破; 穿透; 重要技术成就; 炉衬烧穿;
[例句]The company looks poised to make a significant breakthrough in China
这家公司看来很有把握在中国取得重大突破。
The breakthrough came hours before a UN deadline.
在联合国的最后期限到来前数小时取得了重大突破。
This may have been an improvement, but 'breakthrough' was an overstatement
这算得上是一个改进吧，但说是“突破”就言过其实了。
If such materials became generally available to the optics industry the payoffs fromsuch a breakthrough would be enormous
如果这些材料能够普遍用于光学产业，那么这一突破带来的收益将非常巨大。
With breast cancer, as with many common diseases, there is no obviousbreakthrough on the horizon
对乳腺癌等很多常见疾病来说，目前还看不到有明显的突破。