Grammar Note
通常用于be动词后，表示对某事物熟悉或精通。
熟悉；通晓；了解（最新情况）
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熟悉；通晓；了解（最新情况）
knowing the latest information or details about something; up to date on
She is always up on the latest fashion trends.
她总是了解最新的时尚趋势。
达到特定标准或水平,尤其是知识更新
being up to particular standard or level especially in being up to date in knowledge
Before the exam, I made sure I was up on all the key dates.
考试前，我确保自己熟悉所有关键日期。
Are you up on the new company policy yet?
你了解公司的新政策了吗？
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通常用于be动词后，表示对某事物熟悉或精通。
Dictionary facts from ECDICT, WIKTIONARY.