Whole with comparison; Observation method; The black and white gray adjust; Teach according to his ability.

整体与比较；观察方法；黑白灰色调；因材施教。

youdao

Whole with comparison; Observation method; The black and white gray adjust; Teach according to his ability.

整体与比较；观察方法；黑白灰色调；因材施教。

youdao