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The phrase "are needed when" is grammatically correct and commonly used in written English.
It is often used to indicate a necessary or required action or condition. Here is an example: "Seat belts are needed when driving a car to ensure safety in case of an accident."
Exact(60)
Special operators are needed when accessing variables of another clock.
Pin piles are needed when large diameter piles are difficult to install.
Nonrandomized intervention trials are needed when randomized clinical trials cannot be performed.
Epitopes of universal character are needed when designing subunit vaccines against infectious diseases such as malaria.
Generally, animal models are needed when it is impractical or unethical to study the target animal.
But no wheels are needed when she craves veggie wraps from Arcuri's, a nearby pizzeria.
The result of a numerical experiment suggests that logarithmic terms are needed when there are sharp edges in the configuration.
Traditionally, releases (sometimes known as "model releases") are needed when a person's name or image is used for commercial purposes.
Thus it can be seen that 3D modelling techniques are needed when vertical inertia is not negligible.
However, less control efforts, feedwater and fuel mass rates, are needed when the sliding mode controller is applied.
Remember, too, that you will be charged for repairs that are needed when the contract is over.
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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