事先 (shì xiān) means “in advance; before the event; beforehand; prior”. It is an HSK 5 Chinese word in the HSK 3.0 vocabulary.
Practice each character:
事先要做好充分准备。
Shìxiān yào zuòhǎo chōngfèn zhǔnbèi.
Adequate preparations must be made in advance.
Updated: 2026-05-27