And taking selenium over a long period of time could have toxic effects, they found.
他们还发现，长期食用硒可能会产生毒性效应。
Being out of work for a long period has several negative effects, analysts say.
分析专家指出：长期性失业有一些负面影响。
Radiation had antineoplastic effects and prolonged the survival period.
照射有抑瘤作用，生存期延长。
The side-effects of the drug are unnoticeable within a short period of time.
这种药物的副作用在短期内是不明显的。
The side-effects of the drug are unnoticeable within a short period of time.
这种药物的副作用在短期内是不明显的。
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