Koichi is very sensitive about changes in the weather and he often gets migraines on rainy days.
Tokyo has changed a lot since I visited ten years ago.
Wow! This is amazing! I can see the change already.
Change and change equals even more change.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.