为了保证既有桥的安全运营和尽可能延长其安全使用年限，应对既有桥进行检测、评估。
In order to making the existing bridge safety operation and extending its safe serving time, the bridge detection and evaluation should be done.
达到报废年限后需继续使用的，必须经机动车安全技术检验机构检验合格。
It must pass the motor vehicle safety inspection to be used after reaching retirement life.
为确保地铁结构不渗不漏，满足运营安全和结构使用年限要求，做好地铁结构永久防水至关重要。
The permanent waterproof measures of Beijing Metro are very important to ensure no seepage and leakage axed to satisfy transportation safety and structure operational life requirements.
本工程建筑结构安全等级为二级，设计使用年限为50年。
The safety class of building structure of this project is II and the design working life is 50 years.
为了保证结构在设计寿命期内的安全使用，有必要对结构进行整体疲劳分析，评估其在设计年限内的疲劳损伤程度。
In order to ensure structural safety in the design working life, it is necessary to carry out integrity analysis of fatigue and to evaluate the degree of fatigue damage on the structure.
为了保证既有桥梁的安全运营和尽可能延长它的正常使用年限，应对其进行实时健康监测与安全性评估。
In order to make the existing bridge safety operation and extending its safe service period, the bridge health monitoring and safety assessment should be done in a real-time way.
本工程结构安全等级为二级，设计使用年限为50年。
The safety rating of the engineering structure is grade2and its designed service life is50years.
建筑结构安全等级二级，设计使用年限为50年。
The structural safety class is second class, design working life is 50 years.
随着我国部分房屋建筑使用年限接近设计期限，或者说结构进入老化阶段，结构的健康状况和安全性评估逐步引起人们的关注。
As service life of buildings approaching to projected life, or their structures entering aging stage, people are gradually concerned about the health status of the structure and security estimation.
使用久后电缆线会发生硬化等不安全事故，机器所需的电流增加或电缆线到一定年限必须更换电缆线。
After using a long cable sclerosis unsafe incidents occur, the current required to increase the machine or cable to a certain number of years the cable must be replaced.
使用久后电缆线会发生硬化等不安全事故，机器所需的电流增加或电缆线到一定年限必须更换电缆线。
After using a long cable sclerosis unsafe incidents occur, the current required to increase the machine or cable to a certain number of years the cable must be replaced.
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