zero concentration

• 零富集

zero concentration的用法和样例：

例句

1. Concentration of ore would simply require prolonged interstratal migration.
   要富集成矿只需保持长期的层间循环。
2. Such deposits represent very great concentration of materials once widely dispersed.
   这类矿床表现为一度广泛分散的物质非常高度地富集起来。