“OPTIONAL” на німецькій мові

the qualification is optional

Unlike the Olympics, training is optional and competitors are not subjected to doping tests.

Using an apostrophe to show plurals of numbers, letters, and figures is optional .

Schooling is compulsory and free for the first nine years and optional and free for the next three.

By using an optional plastic film over the glass, the window can be pushed out at once rather than in pieces.