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The phrase "a difficult operation" is correct and usable in written English
It can be used when referring to a task or procedure that requires significant effort, skill, or complexity to accomplish. Example: "Performing heart surgery is considered a difficult operation that demands years of training and experience."
Exact(20)
It was a difficult operation.
'It's the simplest version of a difficult operation.
The problem is getting evidence to show it before putting more patients through a difficult operation.
They have performed a difficult operation on an operation, with excellent results.
"This will be a difficult operation, occurring as it does in the Southern Ocean".
The filling process of liquid suspensions is a difficult operation,mainly due to drug settling.
Similar(40)
"The transfer of men from one ship to another and then to a third ship, in any circumstances, is a potentially difficult operation," Smith said.
"It will be a very difficult operation," Mr. Lacey said.
"It was a tremendously difficult operation to bust," said Bridget G. Brennan, the city's special narcotics prosecutor.
Horgan S, Hudda K, Eubanks T, McAllister J, Pellegrini CA. Does botulinum toxin injection make esophagomyotomy a more difficult operation?
It's a surprisingly difficult operation to sit roughly where you intend, and facing the right direction.
More suggestions(17)
a challenging operation
a complex operation
a complicated operation
a difficult utilization
a difficult performance
a difficult function
a difficult transaction
a difficult operating
a difficult business
a difficult existence
a tricky operation
a difficult endeavour
a difficult word
a difficult approach
a straightforward operation
a daily operation
a difficult subject
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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