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long since
01
很久以前, 早已
from a considerable time before the present or a specified time
long since
adv
例子
The ancient civilization has long since disappeared.
The novel was published, and it has long since become a classic.
The issue was resolved, and it has long since ceased to be a problem.
The once-bustling marketplace has long since become deserted.
They met in college, but they have long since lost touch.
