最終更新日：2022/12/22
例文
It
was
about
this
time
that
the
first
experiments
were
made
(in
Germany)
with
basic
slag,
a
material
which
had
hitherto
been
regarded
as
a
worthless
by-product
of
steel
manufacture.
A
year
or
two
later
field
trials
were
begun
in
England,
with
the
final
result
that
basic
slag
has
become
recognized
as
a
valuable
source
of
phosphorus
for
growing
crops,
and
is
now
in
constant
demand
for
application
to
the
soil
as
a
fertilizer.
復習用の問題
It was about this time that the first experiments were made (in Germany) with basic slag, a material which had hitherto been regarded as a worthless by-product of steel manufacture. A year or two later field trials were begun in England, with the final result that basic slag has become recognized as a valuable source of phosphorus for growing crops, and is now in constant demand for application to the soil as a fertilizer.
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