(六) 累
原因：学习、运动、打工
表达：
I’m exhausted.
I’m tired-out/over tired.
I’m dog tired.
I’m beat/dead beat.
I’m burned out.
run out of steam/energy
be out of energy/shape
I’m worn out.
be tired out
knock oneself out on sth.
eyes are starting to blur
hardly stay awake
hardly concentrate
I’m bushed.
(七) 学生学习用功
around the clock
on end = in a row
day and night = night and day
36/48 hours a day
day in and day out
put a lot of hours/time/days into…
burn the midnight oil
stay up/be up all night
can’t tear oneself away from…
couldn’t put down…
glue one’s eyes to…