Definition
Happening precisely at a specified time.
正值…時，剛到…點
The meeting began at the stroke of nine.
會議在九點整開始。
They began celebrating the New Year at the stroke of midnight.
他們在午夜鐘聲響起時開始慶祝新年。
The race started at the stroke of three in the afternoon.
比賽在下午三點整開始。