検索結果- 英語 - 英語
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you can lead a horse to water, but you can't make it drink
legislature
noun
sex on legs
leave well enough alone
verb
top-level domain
noun
leave someone holding the bag
leaded type
noun
wash-leather
noun
focal length
noun
(optics)
A
measure
of
how
strongly
an
optical
system
converges
or
diverges
light,
the
inverse
of
optical
power.
In
the
simple
case
of
a
single
convex
lens,
it
is
the
distance
along
the
optical
axis
from
the
principal
plane
of
the
lens
to
the
lens's
focal
point
(where,
for
instance,
the
film
would
be
placed
in
a
camera).
For
more
complex
or
multi-element
optical
systems,
focal
length
need
not
correspond
to
any
obvious
measurable
physical
distance.
red letter day
noun
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