for extra credit 怎么翻译?

原句:
For extra credit,look up how these measurements were determined.

measurement:测量法, 度量, (量得的)尺寸, 度量单位制

关键是For extra credit这个词组怎么翻译, "作为额外的知识" 这种翻译好像有点怪怪的.
"额外加分"是愿意,但放在这里不通

翻译句子（Extra points for excellent answers!) _____with a bill for $ 10,000, John has taken an extra job. That is our free delivery area, so there will be no extra charge for the delivery. 是什么意思？ I want one no-foam skimmed latte with an extra shot... and three drip coffees with room for milk. 请求星际里 xxx set network for extra high latency 的详细解释（可追加35分） Extra Sensory Percep 请问nokia extra是什么意思？ a extra edge 是什么意思？ extra additional区别 extra-curricu-laractivities什么意思?