extra 

【1】额外费用

【例】We shall repack the goods and you will have to pay some extras.

我们将重新包装该货，你方必须支付若干额外费用。

【2】额外的

【例】The extra charges are to be for our account.

额外的费用将由我方负担。

【3】格外地，特别地

【例】This product is of extra good quality.

这种产品质量特别好。

extraneous

外来的

【例】Extraneous risks are caused by external factors like theft, pilferage, rusting, contamination, and so on.

外来风险由外部因素，如偷盗、扒窃、生锈、污染等所造成。

extreme

【1】极端的

【例】It is suggested that collection under the terms of D/A should be used with extreme caution.建议在使用承兑交单的付款方式时应极其谨慎。

【2】极端

【例】As to discussing business with customers, it is wrong to be absolute and go to extremes.

关于同顾客商谈交易，绝对化和走极端都是错误的。