additional

ad‧di‧tion‧al S3 W2 / ədɪʃ ə nəl / 形容词

more than what was agreed or expected 同义词 extra :

Additional information can be obtained from the centre.

additional costs/expenditure etc

An additional charge is made on baggage exceeding the weight allowance.

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In everyday English, people usually say extra rather than additional :

He gets extra money from his parents.

THESAURUS

extra in addition to the usual or standard cost, time, amount etc : They let the kids stay up an extra hour. | Some stores charge extra for delivery. | Postage is extra.

additional [仅用于名词前] more than the basic amount or the amount that you expected or agreed. Additional is more formal than extra : An evening job would provide additional income. | There may be an additonal charge for paying bills by credit card.

added [仅用于名词前] extra – used when talking about something that makes something better or more effective : an added benefit | an added precaution | It was a beautiful place, and the good weather was an added bonus . | Use a sunscreen for added protection.

spare [仅用于名词前] kept in addition to the one you usually use, so that it is available if the one you usually use breaks, gets lost etc : a spare key | a spare tyre | a spare set of clothes