最終更新日：2022/12/24
In the 20ᵗʰ century, when the mechanical separation of impurities based upon specific gravity separations and the removal of fine coal particles which are difficult to handle and dewater became the technology of choice, the bituminous coal mining industry produced vast quantities of both gob and fines.
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元となった例文
In
the
20ᵗʰ
century,
when
the
mechanical
separation
of
impurities
based
upon
specific
gravity
separations
and
the
removal
of
fine
coal
particles
which
are
difficult
to
handle
and
dewater
became
the
technology
of
choice,
the
bituminous
coal
mining
industry
produced
vast
quantities
of
both
gob
and
fines.
