自然寿命 meaning in English

natural lifespan

The natural lifetime for such beings is short , compared to the travel time
这样的生命具有的自然寿命与太空旅行的时间相比是短暂的。
The depreciation of the us dollar raises once again the question of how long the natural life of a reserve currency can be
近期美元贬值，再次令人想起储备货币的自然寿命究竟有多长的问题。
First , the ceratoides . l seed belongs to low nutrition seed and it " s nature longetivity was short ; second , because of the harsh environment during seed developing , seeds were short of nutrition and the development were uncomplete ; third , because of the unsuitable storage condition , especially because the water contens was higher , the seed deteriorated rapidly
对驼绒藜属植物种子短命和劣变原因的初步分析，认为是由遗传和环境两方面的原因所至：一是由于驼绒藜植物属于高数量低营养种子类型，种子自然寿命较短。二是由于种子发育过程中自然环境恶劣，造成种子营养不良，发育程度较差。