coaster
noun
ˈkəʊstə
noun
1
a
small
thin
object
on
which
you
put
a
glass,
or
cup,
to
protect
a
table
from
heat
or
liquids
〔杯子等的〕垫子，托垫
2
a
ship
that
sails
from
port
to
port
along
a
coast,
but
does
not
go
further
out
to
sea
沿海航行的轮船