D for diploma
[短语]
a grade just high enough to pass a class or requirement, often earned with minimal effort
Ex:
to stay awake all night, usually to study, work, or complete a task
Ex:
She
pulled
an
all-nighter
preparing
for
her
final exam
.
to [hit] the books
[短语]
to study in a determined and serious manner
Ex:
They
go to
the
beach
when
they
should
be
hitting
the
books
and
then
they
wonder
why
they
get
bad
grades
.