Toxaphene, an organic chloride insecticide possesses a long residual period.

毒杀芬为有机氯杀虫剂的一种，残效期长。

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For the interference of the synchronous reaction substances, we may inquire the patients situation, avoid the drugs residual period, or standard addition method to decrease the interference.

同步反应干扰物的影响可询问病情、避开药物残留期、血清加标回收的办法予以消除。

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This fallout material decays over a long period of time, and is the main source of residual nuclear radiation.

尘降物需要很长的时间才会衰减，这是核辐射残留的主要来源。

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