検索結果- 英語 - 英語
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activity trap
noun
active duty
noun
active fault
noun
ultrahazardous activity
noun
(law)
An
activity
that
is
so
dangerous
that
any
person
engaging
in
it
will
be
held
strictly
liable
for
harm
caused
by
engaging
in
the
activity,
no
matter
what
precautions
were
taken
to
prevent
harm;
common
examples
include
using
explosives,
radiation,
and
poisonous
chemicals,
and
handling
wild
animals.
active listening
noun
active power
noun
activation energy
noun
(chemistry,
physics)
The
energy
required
to
initiate
a
reaction.
For
example,
the
flame
from
the
fuse
of
a
firecracker
provides
a
small
initial
amount
of
energy,
after
which
the
explosive
reaction
proceeds
by
itself,
releasing
a
considerably
larger
quantity
of
energy.
A
small
push
given
to
a
stable
but
top-heavy
object
may
cause
it
to
fall
over;
the
potential
energy
released
during
the
fall
was
present
in
the
system
all
along
but
could
not
be
realized
as
long
as
the
object
was
upright
and
balanced.
active couple
noun
In
set
dances
with
more
than
one
couple
dancing,
the
couple
doing
the
more
complicated
movement
during
any
given
portion
of
the
dance.
The
role
of
active
couple
may
pass
from
one
couple
to
another.
In
many
quadrilles,
certain
figures
will
have
two
active
couples
at
any
one
time;
in
long
set
dances,
quite
often
every
other
couple
or
every
third
couple
is
the
active
couple.
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