英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字，中文词皆可：


请选择你想看的字典辞典：
单词字典翻译
Fistul查看　Fistul　在百度字典中的解释百度英翻中〔查看〕
Fistul查看　Fistul　在Google字典中的解释Google英翻中〔查看〕
Fistul查看　Fistul　在Yahoo字典中的解释Yahoo英翻中〔查看〕

安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • Sound | Properties, Types, Facts | Britannica
    Sound, a mechanical disturbance from a state of equilibrium that propagates through an elastic material medium A purely subjective, but unduly restrictive, definition of sound is also possible, as that which is perceived by the ear Learn more about the properties and types of sound in this article
  • How Does Sound Travel? | Waves, Speed, Frequency, Amplitude - Britannica
    Sound travels in waves that are essentially disturbances that move through a medium by causing particles to vibrate back and forth in the direction of the wave’s travel Imagine a Slinky toy or a coiled spring: when you pull back one end and release it, a wave of compression and expansion of the coils travels along its length Similarly, sound waves consist of alternating compressions and
  • Wave motion | Definition, Examples, Types, Facts | Britannica
    Wave motion, propagation of disturbances—that is, deviations from a state of rest or equilibrium—from place to place in a regular and organized way Most familiar are surface waves on water, but both sound and light travel as wavelike disturbances, and the motion of all subatomic particles exhibits
  • Sound - Frequency, Wavelength, Absorption | Britannica
    Sound - Frequency, Wavelength, Absorption: In addition to the geometric decrease in intensity caused by the inverse square law, a small part of a sound wave is lost to the air or other medium through various physical processes One important process is the direct conduction of the vibration into the medium as heat, caused by the conversion of the coherent molecular motion of the sound wave
  • Sound - Standing Waves, Frequency, Wavelength | Britannica
    Sound - Standing Waves, Frequency, Wavelength: This section focuses on waves in bounded mediums—in particular, standing waves in such systems as stretched strings, air columns, and stretched membranes The principles discussed here are directly applicable to the operation of string and wind instruments When two identical waves move in opposite directions along a line, they form a standing
  • Wave | Behavior, Definition, Types | Britannica
    wave, propagation of disturbances from place to place in a regular and organized way Most familiar are surface waves that travel on water, but sound, light, and the motion of subatomic particles all exhibit wavelike properties In the simplest waves, the disturbance oscillates periodically (see periodic motion) with a fixed frequency and
  • Sound - Frequency, Amplitude, Wavelength | Britannica
    Sound - Frequency, Amplitude, Wavelength: Fundamental to the analysis of any musical tone is the spectral analysis, or Fourier analysis, of a steady-state wave According to the Fourier theorem, a steady-state wave is composed of a series of sinusoidal components whose frequencies are those of the fundamental and its harmonics, each component having the proper amplitude and phase The sequence
  • Sound - Circular, Spherical, Waves | Britannica
    Sound - Circular, Spherical, Waves: The above discussion of the propagation of sound waves begins with a simplifying assumption that the wave exists as a plane wave In most real cases, however, a wave originating at some source does not move in a straight line but expands in a series of spherical wavefronts The fundamental mechanism for this propagation is known as Huygens’ principle
  • Ultrasonics | Physics, Sound Waves Applications | Britannica
    Ultrasonics, vibrations of frequencies greater than the upper limit of the audible range for humans—that is, greater than about 20 kilohertz The term sonic is applied to ultrasound waves of very high amplitudes Hypersound, sometimes called praetersound or microsound, is sound waves of frequencies





中文字典-英文字典  2005-2009