One is " assets" that we buy with money, such as virtual coins and game equipment.

一种是我们花钱购买的 “资产”，如虚拟货币和游戏设备。

Although the game is free to play, game equipment plays a crucial role in generating revenue for the developer through its close ties to advertising.

虽然游戏是免费的，但游戏工具通过其与广告的密切联系，在为开发者创造收入方面发挥着至关重要的作用。