The safety rating of the engineering structure is grade2and its designed service life is50years.
本工程结构安全等级为二级，设计使用年限为50年。
The corrosion resistance of the girder internals is vitally important for designed service life of Bridges.
钢箱梁内部的腐蚀问题，对桥梁的设计使用寿命至关重要。
Kiaochow Bay subsea tunnel is the second self-building tunnel in China with the designed service life over 100 years.
胶州湾海底隧道是中国自行建造的第二条海底隧道，其服役寿命为100 a。
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