advance and Retreat

“Later period”leachate

“Eleventh Five Years”period

‘Tenth Five－Year Plan’period

Left-wing Federation period

Golden period of development

5.4 period

12th five-year plan period

11th-Five-Year Plan Period

11th Five Year Scheme Period

advance and retreat method

The length of acupuncture needle retreat

was forced to retreat

vertical crater retreat mining

unit retreat

Tool advance and retreat

to retreat