那个difficulty 不变复数形式么。求详解

Question

如题所述

Answer 1

difficulty
当“困难,艰难”解释的时候是名词但不可数；当“难事,难处,难题”解释时就可数。例如：
there
are
a
lot
of
difficulties
that
have
to
be
overcome.
有许多困难必须克服。