chasm

chasm
/ˈkæzəm; `kæzəm/ n
1 deep opening in the ground; abyss; gorge （地上的）深坑; 深渊; 峡谷.
2 (fig 比喻) wide difference of feelings or interests between people, groups, etc （人、 团体等的情感或利益的）巨大差距, 分歧
    the vast chasm separating rich and poor 贫富的鸿沟.

牛津英汉双解词典