讲台上，寒来暑往，春夏秋冬，撒下心血点点；

Under the platform, changing seasons, spring, summer, autumn and winter, and little effort;

youdao

讲台上，寒来暑往，春夏秋冬，撒下心血点点；

Under the platform, changing seasons, spring, summer, autumn and winter, and little effort;

youdao