以此

yǐ cǐ lái bǎo chí xiǎo xīn jǐn shèn

以此来保持小心谨慎

use this to stay cautious

yǐ cǐ lái yǎn shì jǐn zhāng de xīn qíng

以此来掩饰紧张的心情

use this to hide your nervousness