Up to or upto: Which Is Correct?
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查看解释
Up to serves several related communicative purposes. When followed by a number or quantity, it specifies a maximum limit: up to three items means three or fewer, never more than three. When followed by a time or event, it indicates an action continuing until that point, such as practicing up to the start of a performance. When followed by a location, it shows the physical boundary reached during travel. Finally, in the idiomatic expression it is up to someone, it indicates that a person has the responsibility or freedom to decide.
Each participant can submit up to three photographs for the exhibition.