基本解釋adj.預先警戒的；預防的；畱心的同根派生 precautional相關詞英漢例句用作形容詞 (adj.)He thrusts aside all precautionary advice.他把一切警告都置之一邊。We have to take precautionary measures.我們不得不採取預防措施。This was purely precautionary with all three players.這完全是對三名球員的預防措施。precautional更多例句