最終更新日：2022/12/22
例文
In
2006,
he
made
a
research
trip
to
China
to
look
for
the
baiji,
also
known
as
the
Yangtze
River
dolphin.
He
and
his
colleagues
searched
the
legendary
river’s
entire
1,700-kilometer
main
channel,
twice.
They
counted
nearly
20,000
large
shipping
vessels
and
more
than
a
thousand
fishing
boats,
but
no
river
dolphins.
At
the
end
of
their
quest,
they
declared
that
the
species
was
likely
extinct,
a
conclusion
now
widely
supported.
For
all
the
terrible
harm
that
humans
have
done
to
cetaceans,
drastically
reducing
their
abundance
and
range,
the
baiji
was
the
first
of
them
that
we
ever
completely
extinguished.
It
happened
in
the
21st
century.
復習用の問題
In 2006, he made a research trip to China to look for the baiji, also known as the Yangtze River dolphin. He and his colleagues searched the legendary river’s entire 1,700-kilometer main channel, twice. They counted nearly 20,000 large shipping vessels and more than a thousand fishing boats, but no river dolphins. At the end of their quest, they declared that the species was likely extinct, a conclusion now widely supported. For all the terrible harm that humans have done to cetaceans, drastically reducing their abundance and range, the baiji was the first of them that we ever completely extinguished. It happened in the 21st century.
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