保持 + 冷静 / 冷静 + 地 + Verb
冷静 (lěngjìng) means "calm" or "composed" and is used as an adjective to describe a state of emotional steadiness. It often appears in contexts where someone is urged to stay level-headed, such as 保持冷静 (keep calm). It can modify nouns directly or follow 很 as a predicate adjective.
遇到紧急情况的时候,你一定要保持冷静。
yùdào jǐnjí qíngkuàng de shíhòu, nǐ yídìng yào bǎochí lěngjìng.
When you encounter an emergency, you must stay calm.
她是一个非常冷静的人,从来不会慌张。
tā shì yí gè fēicháng lěngjìng de rén, cónglái bú huì huāngzhāng.
She is a very calm person and never panics.
别着急,我们冷静地想一想办法。
bié zhāojí, wǒmen lěngjìng de xiǎng yì xiǎng bànfǎ.
Don't worry, let's calmly think of a solution.