Before revision:  We shall see that the descending curves provide valuable information such as the duration of the COVID-19 epidemic in a given Country ( and therefore when it will be possible to return to normal life ) or how long we will still have to undergo the lockdown measures .
After revision:  The descending curves provide valuable information such as the duration of the COVID-19 epidemic in a given Country ( and therefore when it will be possible to return to normal life ) or how long we will still have to undergo the lockdown measures .