老师是在学校里教我们知识的人，我们每天见到老师要问好。
Lǎoshī shì zài xuéxiào lǐ jiāo wǒmen zhīshi de rén, wǒmen měitiān jiàn dào lǎoshī yào wèn hǎo.
This word refers to a person who teaches knowledge at school. It is used as a respectful title when greeting or talking about educators.
在学校里，我们称呼教我们知识的人为老师。老师帮助我们学习和成长。
Zài xuéxiào lǐ, wǒmen chēnghu jiāo wǒmen zhīshi de rén wéi lǎoshī. Lǎoshī bāngzhù wǒmen xuéxí hé chéngzhǎng.
This word is used in school to address someone who teaches knowledge. It refers to a person who helps students learn and grow.
老师 is the teacher; 学生 is the student. They form a natural pair in a classroom.
教师 is a more formal job title; 老师 is the common, friendly way to address a teacher.
同学 means classmate, another person you see at school alongside your 老师.