life expectancy of design的用法和樣例：
例句
- This paper introduces the design working life and durability design for structures in China and abroad, esp.
介紹國內外結構尤其是英國海工結構的設計使用年限及耐久性設計概況。 - The durability design of the concrete structure should be done according to the environment types and the designed serviceable life.
混凝土結構的耐久性設計應根據環(huán)境類(lèi)別和設計使用年限進(jìn)行設計。
