人生有得意也有失意的时候。

Rénshēng yǒu déyì yě yǒu shīyì de shíhou.

Life has times of success and times of frustration.

你别太得意了，你能拿满分是因为题目太简单了。

Nǐ bié tài déyì le, nǐ néng ná mǎnfēn shì yīnwèi tímù tài jiǎndān le.

Don't be so proud of yourself, you can get full marks because the topic is too simple.

原来他考试得了第一名，怪不得他那么得意。

Yuánlái tā kǎoshì dé le dì yī míng, guàibude tā nàme déyì.

It turns out he got the top score on the exam, no wonder he is so proud of himself.