I don't know ----- there is any danger in this type of plane.填if 还是that.我明天就要考试,还有能讲一下I don 't know 后跟that 和if的区别吗,我们老师讲的云里雾里的

I don't know. “i don't know you know i don't know sorry,I don't know. i don`t know much I don't really know. 英语；I don't know I don't know miss I don't know him. I don't know now 翻译 i don't know So know,I don't I don't know her i don't know anything I don’t no I don't know I don't knw I don't know翻译中文, i don't know what i I don't think I know you I know enough to know that I don't know