者 · zhě · (after a verb or adjective) one who (is) ...

那就再来检查。如果又发烧或者更不舒服，也要早点来。

Nà jiù zài lái jiǎnchá. Rúguǒ yòu fāshāo huòzhě gèng bù shūfu, yě yào zǎodiǎn lái.

Then come back for another check. If the fever returns or you feel worse, come back sooner too.

这份鱼比较大，四个人点一份就可以。饺子可以点半斤或者一斤。

Zhè fèn yú bǐjiào dà, sì ge rén diǎn yí fèn jiù kěyǐ. Jiǎozi kěyǐ diǎn bàn jīn huòzhě yì jīn.

This fish dish is fairly large, so one portion is enough for four people. You can order half a jin or one jin of dumplings.

那介绍节日的时候，最好说清楚是‘我们家’或者‘有些地方’。

Nà jièshào jiérì de shíhou, zuìhǎo shuō qīngchu shì ‘wǒmen jiā’ huòzhě ‘yǒuxiē dìfang’.

Then when introducing a festival, it's best to make clear whether you mean ‘my family’ or ‘some places.’