About time idiom

1. from dusk to dawn --> the whole night
2. from dawn to dusk --> daytime
3. the crack of dawn --> the break of day
4. night owl --> 夜貓子, nocturnal
5. midnight (late night) snack --> supper
   

Dictum

The mediocre teacher tells. The good teacher explains. The superior teacher demonstrates. The great teacher inspires.

    By William Arthur Ward