Examples of using Are optional in English and their translations into Polish
{-}
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Colloquial
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Financial
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Official
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Medicine
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Ecclesiastic
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Ecclesiastic
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Official/political
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Programming
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Computer
Five colors are optional.
ceramic material are optional.
Mark: LED and mode are optional on your preference.
Parameters shown in square brackets(e.g.,"[parameter]") are optional.
colors are optional.
Seven colors Ankle Strap are optional.
blame and unified are optional.
plastic buckets are optional.
The temperature is 2-10℃. 2/3/4 layers are optional.
Payment term: EXW, FOB are optional.
Abc any or all arguments within[] are optional.
In the eventuality referred to in the second indent, surveys are optional.
the filter are optional.
The color of the drawers and cabinets are optional.
Delete links are optional now.
I'm sure the gloves are optional.
Fitness checks are optional.
Cylinders and mounting accessories with several specifications are optional.
Bathing suits are optional.
Linen is included but towels are optional.