sanguinity

面对重重困难，她依然保持着天生的乐观自信。

She faced the setbacks with her natural ___sanguinity and a steady smile.

他的自信感染了整个团队，让所有人都相信计划会成功。

His ___sanguinity spread through the team, convincing everyone the plan would succeed.

尽管市场动荡不安，投资者们仍对复苏前景抱有乐观自信。

Despite the market turmoil, investors clung to their ___sanguinity about a quick recovery.