The intrinsic factor influencing the autumn-color leaf is the change of photosynthetic production, and the extrinsic factors are illumination, temperature and moisture.
影响秋色叶变化的内部因素主要是光合产物的变化，外部因素为光照、气温、水分等。
2
Ovalbumin and ovotransferrin in hen egg white are the principal matters in forming of the gelatin, inherent factor and extrinsicfactor are important for egg white gelatin.
Traditionally, the blood coagulation scheme has been divided into extrinsic and intrinsic pathways, converging at the point where factor X is activated.