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笔记本
third classes是third class的复数
third class
美
英
adj.
三等；〈美〉三类邮件(书,广告信等)
复数：
third classes
英汉
英英
adj.
1.
三等,三级,三等品,三等舱
2.
〈美〉三类邮件(书,广告信等)
n.
1.
a
type
of
inexpensive
mail
in
the
U
.
S
.,
usually
used
for
sending
advertisements
2.
a
very
inexpensive
and
low
standard
of
travel
on
trains
and
ships
in
the
past
3.
the
lowest
grade
that
you
can
get
for
an
honors
degree
from
a
university
in
the
U
.
K
.
or
Australia
