他昨天在地铁上丢失了钱包。

Tā zuótiān zài dìtiě shàng diūshī le qiánbāo.

He lost his wallet on the subway yesterday.

他一着急就失去了冷静。

Tā yì zhāojí jiù shīqù le lěngjìng.

As soon as he got anxious, he lost his calm.