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Discover LudwigSuggestions(5)
The phrase "are impossible to identify" is correct and usable in written English.
It can be used when discussing things that cannot be recognized or determined, often in contexts like research, analysis, or problem-solving.
Example: "The sources of the discrepancies in the data are impossible to identify without further investigation."
Alternatives: "cannot be pinpointed" or "are untraceable".
Exact(6)
The few dangerous ones are impossible to identify.
This suggests that small-scale IGWs (10 min) with such amplitude are impossible to identify in observations.
The Fed's position on bubbles remains that they are impossible to identify until after they have burst.
Chairman Greenspan's position on targeting asset bubbles is that they are impossible to identify until after they burst.
The relatively few exceptions are impossible to identify in advance.
Apart from the ethical issues described in the 7th directive (3Rs – reduction, refinement, replacement), the physiology of animal skin and their immune system are so different from humans (23) that pivotal factors responsible for differences between normotrophic, hypertrophic and keloid scar formation are impossible to identify.
Similar(53)
Third, NIS data did not contain personal identifiers, and, thus, it was impossible to identify repeated hospitalizations.
It was impossible to identify them".
The plot was incomprehensible and the new spokescharacter was impossible to identify.
The lack of CCTV meant that it was impossible to identify and apprehend the culprits.
In such a context it's impossible to identify what one particular person contributed.
More suggestions(18)
are impossible to evaluate
are impossible to calculate
are impossible to measure
are essential to identify
are unable to identify
are impossible to understand
are appropriate to identify
are impossible to gauge
are likely to identify
are impossible to meet
are impossible to make
are critical to identify
are able to identify
are difficult to identify
are crucial to identify
are important to identify
are impossible to solve
are necessary to identify
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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