n.金額；總數(shù)；要點

v.概括；總結(jié)；歸納；總計

I had to spend a large sum of money to get it back. 我得花一大筆錢才把它弄回來。

I save a nice little sum out of my wages each week. 我從每周的工資中節(jié)省一筆可觀的金額。

The sum of 5 and 3 is 8. 五加三的總和是八。

Is that the sum of what you've done in the last two years? 這就是你最近兩年中完成的全部數(shù)量嗎？

What I just said is the sum of the book. 我剛才所說的是這本書的要點。

We can sum up the main point of the lesson in three sentences. 我們可以用三句話來概括本課要點。

So, to sum up, we need to concentrate on staff training. 概括地說，我們需要集中精力進行職工培訓(xùn)。

Please sum up what you said just now. 請把你剛才說的總結(jié)一下。

Now, I sum them up in 3 main points. 下面，我將其歸納為三點。

These instances sum up to several dozen. 這些例子總計達(dá)數(shù)十個。

sum作名詞是“算術(shù),總和”的意思,轉(zhuǎn)化為動詞作“總結(jié),合計”解,一般指為了對某一事物有個大概的了解而用數(shù)字等方式對其進行統(tǒng)計,從而得出結(jié)論,強調(diào)結(jié)果而不強調(diào)方法。

sum可用作不及物動詞,也可用作及物動詞,常與up連用,表示合并成一新的整體以產(chǎn)生一種單一而有力的效果。

sum的過去式和過去分詞均為summed。