The best time limit of updating equipment is the economic lifetime of equipment.

从经济效益角度确定的设备更新的最优期限即为设备的经济寿命。

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Updating equipment, reforming technical and improving equipment performance are the key to improve spinning quality and fulfill high quality demand of products.

要进一步提高纺纱质量，满足产品高品质、高档次要求，进行设备更新和技术改造、提高设备性能是关键。

youdao

I am certain that by the end of the century we can surpass the goal of quadrupling the GNP. At that time, when we are strong economically, we shall be able to spend more money on updating equipment.

我看，到本世纪末我们肯定会超过翻两番的目标，到那个时候我们经济力量强了，就可以拿出比较多的钱来更新装备。

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Amtrak officials have heard the silent, hash-tagged screams and say that they are updating equipment on most trains and that passengers should see improvement by the end of the year.

ECONOMIST: Business travel

But Stirrup admits that while the United Kingdom is constantly updating the equipment sent to Afghanistan, the results are delayed.

CNN: Deadly month for British troops in Afghanistan

Much of it has been allocated to basic research funding, although a significant proportion is for updating laboratories and scientific equipment.

BBC: Ministers' ?1bn UK science plea