Such artifacts are viewed as secondary, and therefore as a future maintenance burden.
这样的工件被视为次要的，因此成为未来维护的负担。
2
Historically, models have been used as secondary artifacts, creating a maintenance burden.
从历史上，模型用于次要的工件，生成了维护负担。
3
The method meets the requirement of secondary dilution and avoids the increase of evaporation burden caused by the increase of water amount of the system.