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The phrase "a challenging lesson" is correct and usable in written English.
You can use it when referring to a lesson that is difficult or requires significant effort to understand or master.
Example: "The teacher prepared a challenging lesson on advanced mathematics that pushed the students to think critically."
Alternatives: "a difficult lesson" or "a tough lesson".
Exact(1)
"This has been a challenging lesson for us to absorb, but we take it to heart.
Similar(59)
As teachers we know our students well enough to responsibly judge their emotional intelligence, maturity, knowledge and understanding to ensure a safe but challenging lesson where the best teaching and learning can take place.
The more challenging lesson from the Hole in the Wall is that this learning would most likely not have occurred without technology.
Plan, plan and plan Ensure you prepare exciting, engaging and challenging lessons.
Parents will be able to demand catch-up tuition for their darling dullards, or challenging lessons for their gifted lads and lasses.
I worked hard; I delivered engaging yet academically challenging lessons – despite us all being told that these two concepts were mutually exclusive; I assessed pupils in rigorous detail against ever-changing marking schemes; I completed fatuous administrative tasks within all deadlines.
These are challenging lessons that are never finally learned.
They can give you the latest on what they're covering in the classroom, tailor the tips for upcoming challenging lessons and maybe even give you the solutions you've been looking for.
"This is a challenging project -and we have learned lessons along the way - but we are now in good shape".
Years and two kids later, I have learned many lessons from the temptation to leave a challenging career that has no boundaries.
A "fun" lesson is perceived as having more relevance than a challenging one.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com