Definition (解释)
inherently; because of its essential characteristics or nature.
按定义来说
Psychology is, by definition, not an exact science.
心理学，根据定义，不是一门精确的科学。
The hospitality industry, by definition, exists to meet the needs of others.
酒店业，根据定义，是为了满足他人的需求而存在。
An economic stimulus is, by definition, temporary by nature.
经济刺激，根据定义，本质上是暂时的。