\di-'tri#-<<s\   
( for information on what 
those symbols mean, see http://www.itc-training.com/teflcorner/phonetic.htm )

this might not help much. uh, how about this:

first syllable, the "i" sound is like in "sit".
second syllable, the "tri" sound is like in "fight".
third syllable, "us" is like the "a" in "alone"

got it?