During this critical phase, there will be too few young, productive people who can produce the prosperity required to care for the country's aging population.
在那个紧要阶段，将会有太少的年轻，有生产力的人可以营造能够负担照顾这个国家老年人口的富足。
2
But in working out some of the critical mechanisms, researchers have noticed that the epigenetic part of the genome seems to play crucial roles in growth, aging and cancer.