vassal [ˈvæsl]

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n.附庸的；属下；adj.奴仆的

a person holding a fief

Wales was a vassal kingdom at that time. 那时威尔士是个附庸国。
The vassal swore that he would be loyal to the king forever. 这位封臣宣誓他将永远忠诚于国王。