足 + 以 + Verb Phrase
足 (zú) means 'enough' or 'sufficient' and is a more formal or literary equivalent of 够. It is often used in written Chinese and set phrases to indicate that something meets the required amount or standard, as in 足以 (sufficient to).
他的经验足以胜任这份工作。
Tā de jīngyàn zúyǐ shèngrèn zhè fèn gōngzuò.
His experience is sufficient for this job.
今天的食物足够大家吃了。
Jīntiān de shíwù zúgòu dàjiā chī le.
There is enough food for everyone today.
她准备得很充足,一点也不紧张。
Tā zhǔnbèi de hěn chōngzú, yīdiǎn yě bù jǐnzhāng.
She was well prepared and not nervous at all.