no matter加疑问词引导让步状语从句。
matter：
n. 课题; 事情; 问题; 事态; 当前的状况; (询问某人的情况)怎么了。
v. 事关紧要; 要紧; 有重大影响。
no：int. (用于否定的回答或陈述)不; 没有; 不是; (对某人所说的话感到惊讶)不。
扩展资料
Word always gets out no matter how careful you are.
无论你多么小心，总会有消息走漏。
Parallel lines will never meet no matter how far extended
无论延伸多长，平行线永不相交。
It was up to him to make it right, no matter how long it took
由他负责把事情摆平，不管花多长时间。
No matter how well you know Paris, it is easy to get lost
不管你对巴黎多么熟悉，也很容易迷路。
No matter was too small to warrant his attention.
再小的事也会引起他的注意。
