Chinese English

A WAVE that occurs within a fluid whose DENSITY changes with DEPTH, either abruptly at a sharp surface of discontinuity (an INTERFACE) or gradually. Also called boundary wave.

其密度随深度变化的液体中出现的一种波。内波在突变面(交界面)突然变化或者逐渐变化。也称为boundary wave（界面波，边波）。

A TRANSVERSE WAVE propagated along the BOUNDARY of two elastic media which both have rigidity, i.e. both media must be capable of propagat­ing TRANSVERSE WAVES. A surface seismic wave in which the particles of an elastic medium vibrate transverse to the direction of the WAVE's travel, with no vertical component.

A WAVE in which each individual particle oscillates about a point with little or no permanent change in position. The term is commonly applied to progressive oscillatory waves in which only the form advances, the individual particles moving in closed ORBITS, as ocean waves in deep waters. Distin­guished from a WAVE OF TRANSLATION.

每个质点围绕某个位置无永久性变化或变化很小的点振荡的波。该词常用于每个质点在闭合轨道中移动，仅波形向前推进的渐进振荡波，如深海中的海洋波浪。区别于平移波。

ELECTROMAGNETIC WAVES of FREQUENCIES generally higher than those of audible SOUND WAVES but lower than those of heat and light waves. Also called hertzian waves.

A RADIO WAVE shorter than those of the standard broadcasting band. In OCEANOGRAPHY, WAVES under conditions where the relative DEPTH (water depth/wave length) is greater than 0.5 and where the PHASE VELOCITY is independent of water depth, but dependent upon WAVE LENGTH.

一种比标准广播波段波长短的无线电波。 在海洋学中，是指相对深度（水深/波长）大于0.5且相位速度与水深无关，而与波长有关的波。

An indirect RADIO WAVE which travels from the transmitting ANTENNA into the sky, where the IONOSPHERE bends it back toward the EARTH. Also called ionos­pheric wave. See WAVE: GROUND.

A WAVE OF TRANSLATION consisting of a single CREST rising above the undisturbed liquid level, without any accompanying TROUGH, in contrast with a WAVE TRAIN.

A mechanical disturbance advancing with finite VELOCITY through an elastic medium and consisting of longitudinal displacements of the ultimate particles of the medium, that is, consisting of compressional and rare-factional displacements parallel to the direction of advance of the disturbance; a LONGITUDINAL WAVE. Also called sonic wave, or acoustic wave.

以一定速度穿过弹性介质的机械扰动，它包括介质中大多数质点的纵向位移，即它包括平行于扰动前进方向的压缩位移和澎涨位移，它是一种纵波。亦称sonic wave, or acoustic wave。

A type of WAVE in which the surface of the water oscillates verti­cally between fixed points, called NODES, without progression. The points of maxi­mum vertical RISE and fall are called antinodes or LOOPS. At the NODES, the underlying water particles exhibit no vertical motion but maximum horizontal motion. At the antinodes the underlying water parti­cles have no horizontal motion and maximum vertical motion. They may be the result of two equal progressi­ve WAVE TRAINS travelling through each other in opposite direc­tions. Also called stationary wave.

水表面只是在两固定波节点间垂直振荡，而并不行进的波。垂直升降极大点称为腹点波腹。在各个波节处，水下质点没有垂直运动，而水平方向运动最大。波腹处，水下质点没有水平运动而垂直运动最大，这可能是由两个相向行进的进行波列引起的。亦称stationary wave。