1
sum sth
Can you sum these numbers for me?
你能帮我把这些数字相加吗？
合计；总计；相加
summed — past of sum
先理解核心含义，再看它在真实句子里的用法。
合计；总计；相加
To add together.
Can you sum these numbers for me?
你能帮我把这些数字相加吗？
相加
To add together.
总结
To give a summary of.
sum
Base
原形
sums
3rd person
第三人称单数
summing
-ing
现在分词
summed
Past
过去式
summed
Past participle
过去分词
He sums the numbers quickly.
他快速计算数字的总和。
She is summing the expenses for the report.
她正在合计报告中的开支。
They summed the total yesterday.
他们昨天算出了总数。
规则动词，过去式加-ed。
Can you sum these numbers for me and tell me the total?
你能帮我把这些数字加起来，然后告诉我总数吗？
We summed all the expenses at the end of the trip.
旅行结束时，我们把所有开销加起来。
Let's sum the scores from each round to choose the winner.
我们把每一轮的得分加总，来决定获胜者。
Can you sum these numbers for me?
你能帮我把这些数字相加吗？
宾语为代词时须放在 up 前，如 sum it up。
She summed up the report in one sentence.
她用一句话总结了这份报告。
常用在句首引出总结。
To sum up, we agree with the proposal.
总之，我们同意这个提议。
Not this
Please summary the results.
Use this
Please sum up the results.
汉语的“总结”既可作名词也可作动词，但英语 summary 是名词；表示“总结”这一动作时要用动词 sum up 或 summarize。
Not this
Could you sum the main points?
Use this
Could you sum up the main points?
sum 单独用作动词通常表示“把数字相加”；要表达“概括、总结”时应使用短语动词 sum up。
Not this
He sumed up the conversation.
Use this
He summed up the conversation.
sum 是单音节词，末尾为辅音+元音+辅音，加 -ed 时需双写末尾辅音字母，所以应为 summed。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
总结；概括
Let me sum up what we have discussed.
让我总结一下我们讨论的内容。
把数字相加
Please sum the figures in the last column.
请把最后一列的数字相加。
总计为
The costs sum to more than we expected.
费用合计比我们预期的要多。
总结；概括
To sum up, we need to reduce costs.
总之，我们需要降低成本。
总而言之
In sum, the experiment was a success.
总而言之，这个实验是成功的。
全部；总数
The sum total of her savings was only five hundred dollars.
她的存款总共只有五百美元。
Use summed naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
sum 作动词是“相加”，记忆它的过去式 summed 双写 m，就像把两个数字并拢成一个总数。
语域：mixed 常见场景：math/accounting、speech/writing sum作动词时有“相加”和“总结”两层含义，前者多用于数学或账目等正式场景，后者常以sum up形式出现在演讲或文章结尾。整体上作动词比名词更书面，日常口语更常用add up或sum up。
常与up连用构成短语动词sum up
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY, WORDNET.