学说( theory的名词复数 );理论;原理;意见
"true in fact and theory"
"a scientific hypothesis that survives experimental testing becomes a scientific theory"; "he proposed a fresh theory of alkalis that later was accepted in chemical practices"
同义词:hypothesispossibility
"the architect has a theory that more is less"; "they killed him on the theory that dead men tell no tales"
motivation theories激励理论