Presumably to remind us that they were there at one time in the past.
Written accounts, specifically Pliny the Younger
The Romans abandoned Egypt when it was invaded by the Arabs in 639-42.
The Latin word "relinquere" means to leave or abandon. It is derived from the verb "relinquo," which encompasses the action of leaving something behind or letting it go. In Roman contexts, it often referred to leaving a place or relinquishing rights or possessions.
Prasutagus did not actually leave his possessions to the Romans. He had incurred heavy debts with the Romans to finance his lavish lifestyle. When he died the creditors called in the debts.
Their organs.
nothing
Presumably to remind us that they were there at one time in the past.
Roads and aqueducts were abandoned in France and remained in use for years after the Romans left.
Written accounts, specifically Pliny the Younger
The Romans left roads because they wanted the roads so that they can get to other places of Britain easier and quicker.
Toilets or latrines were part of the infrastructure of the houses and public buildings. There was no way they could be removed.
no
The past tense of "leave behind" is "left behind."
in india what does the water leave behind
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What Leave Behind was created in 2003-05.