vacuum-tube ageing

例句：

1. 1. The vacuum tubes are prone to ageing, which can affect their performance.
   真空管容易老化，这会影响它们的性能。
2. 2.As the vacuum tube ages, its resistance increases, causing a drop in voltage.
   随着真空管老化，其电阻增加，导致电压下降。
3. 3. The vacuum tube is an important component of modern electronic devices, and its ageing process requires special attention.
   真空管是现代电子设备的重要组件，其老化过程需要特别关注。