谨慎小心

zài shǐ yòng zhè fāng fǎ de shí hou yào jǐn shèn xiǎo xīn

在使用这方法的时候要谨慎小心。

Care must be taken in using this method.

wǒ jiào tā yǐ hòu gèng jiā jǐn shèn xiǎo xīn xiē

我叫她以后更加谨慎小心些。

I asked her to be more careful in future.