Once variety of partially biodegradable plastice beverage container is manufactured from small bits of plastic bound together by a degradable bonding agent such as cornstarch. Since only the bonding agent degrades, leaving the small bits of plastic, no less plastic refuse per container is produced whend such containers are discarede than when comparable nonbiodegradable containers are discarded.

这段话该如何理解呢？ manufacture from是什么意思啊？