Question

郊外的空气比市内的好得多。 CCP 12

Accepted Answer

The air in the suburbs is much better than in the city.

A 比 B ~ 得多 used to indicate a big difference between two observations. A is in a higher degree than B. An adjective is often used before 得 as the predicate.

Front	郊外的空气比市内的好得多。
Back	The air in the suburbs is much better than in the city. A 比 B ~ 得多 used to indicate a big difference between two observations. A is in a higher degree than B. An adjective is often used before 得 as the predicate.
Page	CCP 12

郊外的空气比市内的好得多 Air Suburbs City 比 B 得多 Big