机警

yóu jī duì jī jǐng de jiān shì dí jūn de dòng jing

游击队机警地监视敌军的动静。

The guerrillas kept a close watch on the movements of the enemy.

bǎo chí jī jǐng

保持机警

keep one's wits about one

jī jǐng de huí dá

机警的回答

sharp-witted reply

jī jǐng de shì bīng

机警的士兵

a vigilant sentry

tā qīn zì cháng shì le yī xià fā jué zì jǐ biàn de jī jǐng ér mǐn ruì

他亲自尝试了一下，发觉自己变得机警而敏锐。

Trying them himself, he became alert and wide-awake.

jī jǐng de yǎn shén

机警的眼神

alert eyes