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However , it is imperative that you understand how to maximize your overseas health and safety and minimize the risks that do exist through your own preparation and behavior . The text summarises present understanding in these areas , including advances by Russian researchers , not included in the English literature . promotes intercultural understanding , as children explore the role of music in communities around the world . " Our model consists of four primes : ( 1 ) a trigger ( T ) , which stimulates or invokes incomplete understanding on the part of the hearer ; ( 2 ) an indicator ( I ) , which is the hearer 's signal that understanding has not been complete ; ( 3 ) a response ( R ) , which is the original speaker 's attempt to clear up the unaccepted input ( this is often referred to as a repair ) ; and ( 4 ) a reaction to the response ( RR ) , an optional element that signals either the hearer 's acceptance or continued difficulty with the speaker 's repair .