This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. The reading for 留 is the りゅう version. You can remember this because Ryu (りゅう) from street fighter is doing a study abroad program to learn more karate.
"My older brother didn't obey the orders of our parents and left to study abroad." "Where is his study abroad destination?" "It's in the U.S."
When I studied abroad, I practiced speaking Japanese naturally a lot.
Could you reschedule my appointment for next Sunday? On Saturday I have to go to the Japanese Consulate General to get some study abroad documents.