They heard thousands of gunshots...是什么意思？

They heard thousands of gunshots...

他们听到密集的枪炮声。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

heard

v. 听到，听见( hear的过去式和过去分词 )，听说，得知，听取；

例句
He acted as if he hadn't heard any of it...
他表现得好像对此毫不知情。

thousands

n. 数千，一千( thousand的名词复数 )，数千，许许多多，千位数；

例句
...an economy capable of absorbing thousands of immigrants.
能够吸纳数千移民的经济实体

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

gunshots

n. 枪炮射击，枪炮声( gunshot的名词复数 )，枪炮的射程；

例句
The source of the gunshots still remains a mystery.
枪炮声来自何处仍是个谜。