adj.預(yù)先警戒的；預(yù)防的；留心的
He thrusts aside all precautionary advice. 他把一切警告都置之一邊。
We have to take precautionary measures. 我們不得不采取預(yù)防措施。
This was purely precautionary with all three players. 這完全是對三名球員的預(yù)防措施。
