... time of persistence ==> 余辉时间 time of primary migration ==> 初次运移时间 time of propagation ==> 传播时间 ...
权威例句
1.
The wages of blacks rose relative to those of whites over time for two primary reasons: (1) more schooling and better schooling and (2) the migrationof blacks out of the South.
FORBES: Regulations Are Very Expensive, But Their Economic Value Is Negative