learnern.学习者
learnv.学会;学习;得知
learn from sb's mistakes从某人的错误中受到教益
learn from past mistakes从犯过的错误中学习, 吸取教训
learn tandem accelerator教学用串列式加速器
Learn by trial and error通过反覆试验学习
learng wirh great effort“发愤著书”
learn ... by heart牢牢记住, 用心学
learn-leading tcaching学导式教学法
learn something by heart谙记;背诵出