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nothing besides outdoor ones will look older and more dirty as indoor will look new. and outdoor is outside and indoor is inside.
A label.
None! Unless the grower doesn't know what he is doing.
Indoor athletic training usually doesn't make people sweat. Outdoor training usually makes people really tired or makes people sweat.
outdoor
outdoor
an indoor stadium
It is an indoor game, but can play outdoor when there is no any strong wind.
outdoor
Outdoor
it is an outdoor plant
indoor