有些塑料随着时间的推移而改变。
Pioneer and successional plant communities are said to change over periods from 1 to 500 years.先驱者和演替植物群落据说是以1-500年的时间区间变化的。
Any take-back program will likely change over time, depending on what works for your customers and company goals.任何回收计划都可能随着时间的推移而改变,这取决于对你的客户和公司目标吃哪一套。