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GRE阅读笔记NO7-1
NO. 7-1
Section 1
Our visual perception depends on SE
the reception of energy reflecting or
radiating from that which we wish to
perceive. If our eyes could receive and
(5) measure infinitely delicate sense-data,
we could perceive the world with
infinite precision. The natural limits
of our eyes have, of course, been
extended by mechanical instruments;
(10) telescopes and microscopes, for example,
expand our capabilities greatly. There TS
is, however, an ultimate limit beyond 指示词
which no instrument can take us; this
limit is imposed by our inability to
(15) receive sense-data smaller than those ﹤
conveyed by an individual quantum of
energy. Since these quanta are believed 指示词
to be indivisible packages of energy
and so cannot be further refined, we
(20) reach a point beyond which further
resolution of the world is not possible.
It is like a drawing a child might make
by sticking indivisible discs of color
onto a canvas.
(25) We might think that we could avoid
this limitation by using quanta with
extremely long wavelengths; such quanta
would be sufficiently sensitive to
convey extremely delicate sense-data.
(30) And these quanta would be useful,
as long as we only wanted to measure ⊙
energy, but a completely accurate SE 指示词—
perception of the world will depend also
on the exact measurement of the lengths
(35) and positions of what we wish to
perceive. For this, quanta of extremely
long wavelengths are useless. To
measure a length accurately to within a
millionth of an inch, we must have a
(40) measure graduated in millionths of an
inch; a yardstick graduated in inches is
useless. Quanta with a wavelength of one
inch would be, in a sense, measures
that are graduated in inches. Quanta of
(45) extremely long wavelength are useless in
measuring anythin
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