able to be maintained at a certain rate or level 能保持一定速度(或水平)的,能持续的,能保持的 sustainable fusion reactions. 持续的核聚变反应。 ■(Ecology)(especially of development, exploitation, or agriculture) conserving an ecological balance by avoiding depletion of natural resources (生态)(尤指发展、开采、农业)可持续性的 ■able to be upheld or defended 站得住脚的 sustainable definitions of good educational practice. 有关良好教育实践的那些站得住脚的定义。