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Đồng nghĩa
arduous
/ˈɑɚʤəwəs/
US
UK
adjective
[more ~; most ~] :very difficult
He
went
through
a
long
and
arduous
training
program
.
arduous
efforts
years
of
arduous
study
an
arduous
chore
/
duty
/
job
/
task
an
arduous
journey
across
miles
of
desert
US