理化因素 lǐ huà yīn sù

DEFINITIONS

  1. physical and chemical factors

CHARACTERS

理 lǐ
HSK 3
reason, logic; manage
化 huà
HSK 3
change, convert, reform; -ize
因 yīn
HSK 2
cause, reason; by; because (of)
素 sù
HSK 5
white (silk); plain; vegetarian; formerly; normally