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The phrase "are tricky and sometimes" is correct and usable in written English.
It can be used when discussing something that has complexities or challenges that may not always be present.
Example: "The rules of the game are tricky and sometimes difficult to understand for new players."
Alternatives: "can be complicated and occasionally" or "are challenging and at times".
Exact(1)
The models are tricky, and sometimes of questionable relevance to humans, and fish are simpler than humans in terms of the complexity of their neural networks – but I have confidence that we will be able to extrapolate from fish to human behaviour.
Similar(59)
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Praise, like sugar, can be tricky -- and sometimes it shows up even where we don't intend.
Applying the strip can be tricky and sometimes difficult to accomplish.
These "wrongful termination" cases are tricky and as Pavlovich underscores, sometimes the filing of such arbitration is akin to walking into a mine field.
Alcor acknowledges that the process is tricky and that sometimes the brittle corpses, or patients as it refers to them, can fracture on immersion.
Analysts in the banking industry say that lending to low-income customers, especially those with tarnished credit, is tricky and that banks sometimes have to charge higher rates to offset their risk.
If you need further help with search tips for recordings, contact us – music searching can sometimes be tricky, and we're glad to help!
Morris's relationship with his managers has sometimes been tricky and McClaren is Derby's fifth manager of the calendar year: Paul Clement began it in charge, then after he was sacked Darren Wassall took over until the end of the season.
Creating images for social media can sometimes be tricky and time consuming.
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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