There are many reasons why the relationship between the disease and the triggering factors is complex and hard to comprehend. However, one can be certain that "there are certainly a great number of factors today which can lead to illness," say Lan Chung-fu. As a result, people's immunity is lowered.
但可以確定，「在今天的生活環境中，誘發或引起人們生病的因子確實非常多」，藍忠孚說，人們免疫力也因此降低。