The decline of agriculture's contribution to total output value has not seen a simultaneous decline in the number of people dependent on it for livelihood.
农业在整体生产总值中比重正下降，但农业人口的数量并未同期减少。
2
Since the 1970s China's birth rate, and therefore the number of dependent children, has been plummeting, whereas the number of elderly people has been rising only gradually.
Similar to RAID, IDA permits the reconstruction of data from a subset of the original data, with some amount of overhead for error codes (dependent on the number of tolerated failures).