You do half the sum of the parallel sides...

上下两边之和除以二。

I wasn't good at doing sums in my head - you know - mental arithmetic.

我不擅长用脑计算，也就是心算。

The boy was puzzled by the intrusion. " Lord Davos, Ser Andrew. We were doing sums" .

男孩对来客的闯入迷惑不解。" 戴佛斯大人，安德鲁爵士。我们正在做算术。"

'She can't do sums, 'said the Red Queen. 'What about languages? And can you read? '

“她做不了算术，语言能力怎样？能读书吗？”红方王后问。

If Penny has nothing to do, summed up her big brother Garry, she will choose to have a depressing thought.

“如果佩妮没事可做，”她的哥哥加里总结道，“她会选择一个令人沮丧的想法。”

This cold evolutionary logic was captured in this cartoon, which really does sum up a hundred of mate-selection research.

这部漫画捕捉到了这种冰冷的进化逻辑，它确实总结了数百项择偶研究。

Eleseus was clever enough in his way—only to see him write on a paper, or do sums with a bit of chalk!

Eleseus 在他的方式上足够聪明——只看到他在纸上写字， 或者用粉笔做算术！

Not a golden penny, exactly, but I doubt if half a million would have given more real happiness then did the little sum that came to her in this wise.

确切地说，并不是很大的一宗财富，但是依我看，即使是五十万块钱也未必能比这么得到的一笔小款子带来更多真正的欢乐。

" She doesn't understand why Lottie is doing her sums so well, " she said; " but it is because she creeps up here, too, and I help her" .

“她不明白为什么洛蒂的算术学得这么好，”她说； “但那是因为她也爬到这里来了，而我帮助了她”。