a payment or gift added to what is usual or expected, in particular
额外给予的报酬(或礼物),尤指:
an amount of money added to a person's wages , especially as a reward for good performance
奖金
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big Christmas bonuses .大笔的圣诞节奖金。
〈英〉 红利。
〈英〉 (分给参加保险者的)余利。
a welcome and often unexpected circumstance, action, or service that accompanies and enhances something that is itself good
(附带的)好处,优点
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good weather is an added bonus but the real appeal is the landscape .晴朗的天气是额外的好事,但真正吸引人的还是此处的风景。
"late 18th cent. (probably originally Stock Exchange slang): from Latin