In comparison with the city, the low-level balance that the high fertility and low accumulation rate of human capital in countryside area cause is the reason that the farmer income grows difficultly.
相对于城市来说，农村地区的高生育率和低人力资本积累率所导致的低水平均衡，是农民收入增长困难的重要原因；
The results show that neutron radiation embrittlement, corrosion damage, fatigue and wear are the key issues which cause aging or degradation of un replaceable or difficultly replaceable components.
分析表明，中子辐照脆化、腐蚀损伤、疲劳及磨损引起核电厂不可更换部件及更换困难部件的老化、降级是制约或极大程度影响电厂寿命的关键问题。
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