fractional change

• 分数变化

fractional change的用法和样例：

例句

1. The change of contents of free amino acids in Chinese fir leaves of tissue culture seedlings and the allelopathic effect were studied under salicylic acid stress.
   摘要在杉木自毒物质邻羟基苯甲酸胁迫下，对杉木组培苗叶片游离氨基酸质量分数变化及化感效应进行研究。