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protracted    音标拼音: [protr'æktɪd]
a. 拖延的

拖延的

protracted
adj 1: relatively long in duration; tediously protracted; "a
drawn-out argument"; "an extended discussion"; "a lengthy
visit from her mother-in-law"; "a prolonged and bitter
struggle"; "protracted negotiations" [synonym: {drawn-out},
{extended}, {lengthy}, {prolonged}, {protracted}]

Protract \Pro*tract"\, v. t. [imp. & p. p. {Protracted}; p. pr.
vb. n. {Protracting}.] [L. protractus, p. p. of protrahere to
forth, protract; pro forward trahere to draw. See
{Portrait}, {Portray}.]
1. To draw out or lengthen in time or (rarely) in space; to
continue; to prolong; as, to protract an argument; to
protract a war.
[1913 Webster]

2. To put off to a distant time; to delay; to defer; as, to
protract a decision or duty. --Shak.
[1913 Webster]

3. (Surv.) To draw to a scale; to lay down the lines and
angles of, with scale and protractor; to plot.
[1913 Webster]

4. (Zool.) To extend; to protrude; as, the cat can protract
its claws; -- opposed to {retract}.
[1913 Webster]


Protracted \Pro*tract`ed\, a.
Prolonged; continued.
[1913 Webster]

{Protracted meeting},a religious meeting continued for many
successive days. [U. S.]
[1913 Webster] -- {Pro*tract"ed*ly}, adv. --
{Pro*tract"ed*ness}, n.
[1913 Webster]


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  • 2. 3: Spherical Mirrors - Physics LibreTexts
    Figure 2 3 3: (a) Rays reflected by a convex spherical mirror: Incident rays of light parallel to the optical axis are reflected from a convex spherical mirror and seem to originate from a well-defined focal point at focal distance f on the opposite side of the mirror The focal point is virtual because no real rays pass through it
  • Spherical Mirrors - GeeksforGeeks
    A spherical mirror is a mirror whose reflecting surface is a part of a hollow sphere It is usually made of glass with a reflective coating (silver or aluminium) on one side and a polished surface on the other where reflection occurs There are two types of spherical mirrors: concave and convex mirrors A concave mirror reflects light from its inner curved surface, while a convex mirror
  • [Solved] The aperture of a spherical mirror is: - Testbook. com
    The aperture determines the amount of light that can enter the mirror and thus affects the brightness and clarity of the image formed In a spherical mirror, the reflecting surface is a part of a sphere, and the aperture is a circular opening
  • What is the aperture of a spherical mirror, and how is it . . .
    The aperture is commonly represented by the symbol “MN” in illustrations The reflecting surface of a spherical mirror, whether concave or convex, has a circular shape The aperture is the distance across this circular surface, typically measured as the diameter It plays a role in determining the amount of light the mirror can collect or
  • The aperture of a spherical mirror is: - Prepp
    To understand the concept of a mirror's aperture, we need to consider a spherical mirror's structure In a spherical mirror, the aperture is defined as the diameter of its reflecting surface This means it is the straight-line distance across the full width of the mirror's curved, reflecting portion Given the options: The distance between the object and the mirror The distance between the
  • What is the aperture of a spherical mirror - KnowledgeBoat
    The plane surface area of the mirror through which light rays enter and fall on the mirror is called its aperture
  • 2. 2 Spherical Mirrors - University Physics Volume 3 | OpenStax
    Curved Mirrors We can define two general types of spherical mirrors If the reflecting surface is the outer side of the sphere, the mirror is called a convex mirror If the inside surface is the reflecting surface, it is called a concave mirror Symmetry is one of the major hallmarks of many optical devices, including mirrors and lenses





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