Miàn / duì / tū / fā / qíng / kuàng / tā / yī / fǎn / cháng / tài / biǎo / xiàn / de / fēi / cháng / lěng / jìng

面对突发情况，她一反常态，表现得非常冷静。

Faced with the unexpected situation, she acted uncharacteristically and remained very calm.