He knew they were tracing him.是什么意思？

He knew they were tracing him.

他知道他们正在追踪他。

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

knew

v. 知道（ know的过去式 ），了解；

例句
She knew who to ask about finding an abortionist.
她知道向谁去打听找一个为人堕胎的。

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。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

tracing

n. 追踪，追查，描摹，摹图；v. 描绘( trace的现在分词 )，追溯，发现，跟踪；

例句
The public is urgently requested to assist police in tracing this man...
紧急要求公众帮助警方追踪此人。

him

pron. (he的宾格)他；

例句
They said goodbye to him as he got aboard the train at Union Station.
当他在联合火车站登上火车之际，他们向他道别。