The essence of medicinal properties cannot be separated from yin and yang, and the smell of medicine varies in intensity,

There are different types of medicinal properties: light upward and heavy downward,

There are differences in medicinal properties between cold and warm,

The odor varies in intensity and severity, with a mix of cold and heat, and a mixture of yin and yang,

There are many situations where the odor is similar but the medicinal properties are different, or where the odor is significantly different but the medicinal effects are similar, and so on.
药性的根本离不开阴阳，药的气味有浓厚淡薄不同，

药性有轻浮向上，重沉向下的不同，

药性还有寒凉，温热的不同，

气味浓薄不同，轻重不等，寒热相杂，阴阳相混，

气味相似但药性不同，或者气味差异很大，但是药效却相近，等等很多情况。