他在比赛中保持沉着冷静。

Tā zài bǐsài zhōng bǎochí chénzhuó lěngjìng.

He remained calm and composed during the competition.

遇到突发情况时，他显得非常沉着。

Yùdào tūfā qíngkuàng shí, tā xiǎnde fēicháng chénzhuó.

When facing an unexpected situation, he appeared very calm.