An ageing lens goes yellow , cloudy and hard .

一个正在老化的晶体变黄、混浊和变硬。

Other ageing cities should take note .

其他老化城市也应该注意到这一点了。

Unfortunately these reactors are ageing and unreliable .

不幸的是，这些反应堆都易老化且不可靠。

Several reports have pointed to the nuclear industry 's ageing profile .

已有几项报告指出了核能行业人才老化的趋势。

But the decline is almost wholly explained by a rapidly ageing population .

但这种下降几乎可完全归因于日本人口的快速老化。