sustainable

definition: 
Able to be maintained at a certain rate or level; Conserving an ecological balance by avoiding depletion of natural resources
sentence: 
Able to be maintained at a certain rate or level: The challenge for any developing country lies in achieving a level of sustainable economic growth. Monetary policy alone cannot achieve high and sustainable rates of economic growth. Conserving an ecological balance by avoiding depletion of natural resources: It is time to envision and design the plane of sustainable agriculture and dream of it really flying
difficulty: 
easy
toefl frequency: 
3
toefl classification: