Is this sentence ok?
(in a stadium etc. spectators are throwing things into the field.
and would you anounce this?

"Don't throw any foreign materials into the field."

Question

Is this sentence ok?
(in a stadium etc. spectators are throwing things into the field. 
and would you anounce this?

"Don't throw any foreign materials into the field."

Answer

"Don't throw any foreign *objects *onto the field." This sentence sounds perfect.

English also has its own verb for this concept: to litter. 
e.g. "Do not litter the field."

Answer

Please, "don't throw any objects into the field".    Most understand anything thrown is foriegn and is not necessary to say.

Answers · 3

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