crucial

The witness's testimony proved to be crucial in securing a conviction during the high-profile trial.

(Chinese) 证人的证词在这一备受瞩目的审判中被证明对定罪至关重要。

Finding a reliable source of clean water is a crucial step in setting up a base camp in the wilderness.

(Chinese) 寻找可靠的清洁水源是在荒野建立基地营地的关键一步。