thunder

Compared meaning: a loud, deep sound (noun).

比较义项：巨大低沉的响声（名词）。

• boom

  Boom describes one sudden, deep, resonant sound, such as an explosion or distant blast; it emphasizes a single short burst, not ongoing noise.

  boom 指一声突然、低沉、洪亮的响声，比如爆炸声或远处的巨响；强调的是单次短促的爆发声，而不是持续不断的噪音。

  A loud boom echoed across the valley when the fireworks exploded.

  烟花爆炸时，一声巨响在山谷间回荡。

• roar

  Roar describes a loud, continuous, powerful sound, often from an engine, crowd, or animal; it suggests sustained intensity rather than a single burst.

  roar 指一种响亮、持续、有力的声音，常用于发动机、人群或动物，强调的是持续不断的强度，而不是单次的爆发声。

  The roar of the engine grew louder as the car sped down the highway.

  汽车在高速公路上疾驰时，发动机的轰鸣声越来越响。

• thunder 本词

  Thunder refers specifically to the deep rumbling sound that follows lightning during a storm; it typically rolls or rumbles rather than bursts suddenly.

  thunder 专指暴风雨中闪电过后传来的低沉隆隆声；这种声音通常是滚动、隆隆作响的，而不是突然爆发的。

  Thunder rumbled in the distance long before the storm finally reached us.

  早在暴风雨真正到来之前，远处就已传来隆隆的雷声。

• roaring

  Roaring usually functions as an adjective or ongoing noun describing continuous loud sound from nature, like wind, fire or a waterfall, often modifying another noun.

  roaring 通常用作形容词或表示持续状态的名词，用来描述来自自然界（如风、火或瀑布）的持续巨响，常常修饰另一个名词。

  The roaring of the waterfall grew louder as we walked closer to the cliff.

  我们走近悬崖时，瀑布的轰鸣声越来越响。

Boom, roar, thunder, and roaring can all mean a loud, deep sound, but differ in type. Boom means one sudden sound. Roar means a loud, continuous sound, from an engine. Thunder means the sound after lightning. Roaring usually modifies a noun, describing sound from nature.

这几个词都可以指巨大低沉的声音，但侧重的声音类型和语气不同：boom 强调突然的一声巨响，roar 和 roaring 强调持续不断的轰鸣，thunder 专指雷声。这里不比较 boom 的“经济繁荣”义、roar 的动词义（吼叫）以及 roaring 在“roaring success”等短语中表示“非常成功的”的引申义。