得出土壤中二英类物质各异构体的提取效率与提取次数有关。
The results showed that the extraction efficiency of various isomers of PCDD/Fs in the soils was related to the extraction times.
二恶英是一类剧毒物质，可导致生殖和发育问题，损害免疫系统，干扰激素，还可以导致癌症。
Dioxins are highly toxic and can cause reproductive and developmental problems, damage the immune system, interfere with hormones and also cause cancer.
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