Your teacher is not only respected, it is hard gardener.

你们既是尊敬的老师，更是辛勤的园丁。

youdao

The teacher is hard gardener, and wish you good, melon and fruit fragrance.

老师是辛勤的园丁，祝愿您风调雨顺、瓜果飘香。

youdao

Teacher, you are a hard gardener, selfless fearless for us these saplings pruner "leaves".

老师，您是一位辛勤的园丁，无私无畏的为我们这些小树苗们“修枝剪叶”。

youdao

So presumably, the notice would not apply to your plumber whom you hire to install a new faucet at home, nor to the gardener who prunes the trees in your hard several times a year, even if he does it year in and year out for 20 years.

FORBES: Miranda-Like Warnings To Independent Contractors?