英和和英

evolution and involution

biodiversity and conservation

a cycle of reprisal and retaliation

possibility and impossibility

prosperity and profitability

constant and cumulative improvement

skillfulness and unskillfulness

attraction and repulsion

conservatives and reformists

reciprocal action and reaction

high risk and high return

modulation and cadence

attraction and repulsion

Aulestantiality and vacantness

quality and quantity

liveliness and eagerness

the characteristics of both malleability as well as ductility

poverty and success

preparation and review

apprehend and reproduce accurately

action and reaction

action and reaction

implementation and coping

convulsion characterized by alternating contractions and relaxations

to be able to turn something over

immigration and naturalization

characterized by repetition

marked by repeated cycles

subjectivity and objectivity

the processes of prospering and declining