be
serious
about＝
用心、认真对待；例子：the
main
point
is
to
be
very
serious
about
guitar
playing.重点是要非常认真的演奏吉他。
be
strict
with＝严格要求，例子：at
the
beginning
of
this
term
the
teacher
in
charge
of
our
class
was
very
strict
with
us.这学期开始,我们的班主任老师对我们要求非常严格。
be
strict
in＝严于；
