The true meaning and mechanism of teachers' practical knowledge of teaching can be known only by closing the reality of their teaching life.

只有对教师教学生活的现实接近才能真正把握教师教学实践性知识的真正内涵和机理。

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During my first year of teaching, I sometimes wondered if the knowledge would ever have any practical use.

NPR: An Outstanding Name for an Outstanding Student

Thinking of engineers here, and the clamoring for more engineering degrees, anyone teaching the discipline would as a rule be imparting knowledge of no practical use.

FORBES: Sorry Left AND Right, No Job Requires A College Degree