警惕性

tā fàng sōng le yī diǎn jǐng tì xìng yě jiàng dī le

他放松了一点，警惕性也降低了。

He relaxed a little, dropping his guard.

tí gāo jǐng tì xìng

提高警惕性

heighten vigilance

yī dàn rén lèi de tóu zī jǐng tì xìng hé kòng zhì bù zú zhè zhǒng jí bìng jiù huì xīng fēng zuò làng

一旦人类的投资、警惕性和控制不足，这种疾病就会兴风作浪。

This is a disease that can take full advantage of any lapse in investment, vigilance, or control.