老师 lǎoshī 和 hé 他 tā 的 de 学生 xuésheng 们 men 都 dōu 解 Xiè 不 bù 出 chū 那道题 Tí .

Neither the teacher nor his students know how to work out the problem.

这道题 Tí 虽然 suīrán 错综复杂 cuò zōng fù zá , 但 dàn 用 yòng 电子计算机 diàn zǐ jì suàn jī 很快就 jiù 能 Néng 解 Xiè 出 chū .

Although the problem is intricate and complex, it can be solved very quickly with an electronic computer.

这 zhè 道 dào 题 Tí 看 kān 起来 qǐlai 很 hěn 简单 jiǎndān , 但 dàn 当 dāng 你 nǐ 要 yāo 解 Xiè 它 tā 时 shí 你 nǐ 就 jiù 会 huì 发现 fāxiàn 它 tā 确实 quèshí 是 shì 一 yī 道 dào 难题 nán tí ...

The problem looks simple enough, but when you come to try and solve it you'll find it's a real teaser.

“ 嗨 hāi , "杜洛埃说 shuì , 对 duì 她 tā 的 de 语气 yǔqì 感到 gǎn dào 大惑不 bù 解 Xiè , " 你 nǐ 早就 zǎo jiù 知道 zhīdào 这 zhè 件 jiàn 事 shì 了 le , 对不对 duì bù duì ? ”

" Why,'said Drouet, puzzled at her tone, " you knew that, didn't you? "