The little boy was playing with a sick partner. When others advised him, he said that healthy people were not afraid of infection.
The little boy went to high school. He played with the "bad boy". The teacher advised him that people with good nature are not afraid of going bad.
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So the teacher kindly advised him to pay attention to his "good student" image.
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A healthy body is not afraid of infection A person with good nature is not afraid of deterioration.