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On the average generally, usually(ÀϹÝÀûÀ¸·Î; ´ëü·Î; Æò±ÕÇÏ¿©; ÀϹÝÀûÀ¸·Î; º¸Åë): On the average I get about eight hours of sleep every night.
On the ball be well-informed and know what's going on in their area of responsibility or interest(ÀÏÀÌ ¾î¶»°Ô µ¹¾Æ°¡´ÂÁö ÈÍÈ÷ ¾Ë´Ù[»çÁ¤À» ²ç°í ÀÖ´Ù]): The new publicity manager is really on the ball.
On the beam to be doing well, to be just right or correct(Á¦´ë·Î Àß µÇ´Â, Á¤È®ÇÑ, È®½ÇÇÑ): What the politician said about the tax problem was right on the beam.
On the bench to be sitting/waiting for a chance to play in a sports game(¼±¼ö ´ë±â¼®¿¡¼ ±â´Ù¸®°í ÀÖ´Â): The player was on the bench.
On the bench to be directing a session of court(ÀçÆÇ°üÀÌ µÈ): The new judge was on the bench for three days last week.