Provide stable URLs so users looking for old pages can find them.
提供稳定的 URL，这样需要使用旧网页的用户就能顺利找到这些网页。
The heat supply network currently has its stable users, and as new networks are built and old ones are constantly renovated and extended, income from heat supply will increase greatly.
供热管网目前已有稳定的用户，随着未来新管网建设不断增加、老管网不断改造扩建，供热收益会有较大幅度增长。
Products of good quality, stable performance by the old and new users.
产品质量优良，性能稳定深受新老用户好评。
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