在于 (zàiyú) – lie in, depend on

Pattern

• Noun（关键 / 原因 / 问题 / 目的） + 在于 + Noun / Verb phrase

Usage

• A written verb pointing out where the essence, key, cause or purpose lies; the subject is usually 关键, 原因, 问题, 重点, 目的, 意义.

Examples

1. 1

   选择职业的关键在于兴趣和能力。

   Xuǎnzé zhíyè de guānjiàn zàiyú xìngqù hé nénglì.

   The key to choosing a career lies in interest and ability.

2. 2

   俗话说，生命在于运动。

   Súhuà shuō, shēngmìng zàiyú yùndòng.

   As the saying goes, life lies in movement.