n.自动点火，自燃，自点火...

Such coal autoignition is a big hidden trouble to the coal storage.煤炭自燃火灾严重影响煤炭的安全生产和储藏....

autoignition的音标：autoignition的英式发音音标为：[ɔ:tɔɪ'nɪʃn]autoignition的美式发音音标为：[ɔtɔɪ'nɪʃn]...