The microRNA, miR164, has been implicated in aging in Arabidopsis and was part of a complex genetic chain that changed as leaves aged.
其中MIR164这个微RNA，在Arabidopsis的衰老进程中被确认是一个复杂遗传链条的部分，那链条随着树叶的衰老而变化。
A number of factors could be affecting the middle-aged, including taking care of aging baby-boomer parents, or coping with substance abuse or unemployment.
一系列的因素将会影响中年人群，比如说照顾衰老的父母，或者是面对失业或者药物滥用。
By world standard, a country will be called aging when the number of people aged over 60 accounts for 10% of its total population.
按国际标准，年龄超60岁的老人占人口总数的10%，该国即进入老龄社会。
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