Item A, Item B, 等等
The particle 等等 (děngděng) is placed at the end of a list to indicate that the list is not exhaustive, similar to "etc." or "and so on" in English. It signals to the listener that there are more items of a similar kind beyond what was mentioned. Simply list two or more items and add 等等 at the end.
我们买了苹果、香蕉、橘子等等,花了不少钱。
Wǒmen mǎi le píngguǒ, xiāngjiāo, júzi děngděng, huā le bù shǎo qián.
We bought apples, bananas, oranges, and so on — it cost quite a bit.
周末可以去爬山、看电影、逛街等等。
Zhōumò kěyǐ qù páshān, kàn diànyǐng, guàngjiē děngděng.
On the weekend you can go hiking, watch a movie, go shopping, and so on.
这家店卖咖啡、果汁、奶茶等等,饮料种类很多。
Zhè jiā diàn mài kāfēi, guǒzhī, nǎichá děngděng, yǐnliào zhǒnglèi hěn duō.
This shop sells coffee, juice, milk tea, and so on — they have a wide variety of drinks.