甲醛释放量与老化周期成指数关系。
The formaldehyde emission and the decay period is exponent relationship.
生物学家Leonard Hayflick和Paul Moorhead于1961年发现这个细胞老化减缓的现象，他们认为这是正常细胞生长周期中的一个普通环节。
This slowdown, first identified in 1961 by biologists Leonard Hayflick and Paul Moorhead, is a normal part of cellular life cycles.
根据本标准，所有老化试验的参照品必须包括采用的试验循环周期的完整说明。
All references to exposures in accordance with this practice must include a complete description of the test cycle used.
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