This is the 931st most frequent Chinese word.
升级
"Upgrade" or "escalate."
Here, 升级 refers to the process of updating a software or technological tool to a more recent version.
这款软件可以免费升级到最新版本。
This software can be upgraded to the latest version for free.
Here, 升级 indicates a progressive increase in the level of difficulty or intensity.
游戏的难度逐渐升级，让人更具挑战性。
The difficulty of the game gradually escalates, making it more challenging.
In this sentence, 升级 is used to describe someone's promotion to a higher position within their organization.