单词学习：thrall 名词
thrall
/θrɔːl/
奴役，束缚；奴隶
Mr. Gu was once in thrall to outdated teaching methods, but he has since embraced innovative educational technologies.
顾老师曾一度受制于过时的教学方法，但后来他接受了创新的教育技术。
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