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thumbtack的复数形式为：thumbtacks...
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I press the thumbtack into the board with thumb.我用大拇指将图钉按在木板上.The thumbtack pricked his index finger.大头针扎了他一下手指.He pinned up the notice with a thumbtack.他用图钉将通知挂起来....
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thumbtack的音标：thumbtack的英式发音音标为：['θʌmtæk]thumbtack的美式发音音标为：['θʌmˌtæk]...