Zài zhòngrén de zhùshì xià, tā tàiránzìruò de zǒu shàng jiǎngtái.
Under everyone's gaze, she walked onto the stage with perfect composure.
Tips
usage
Used to praise someone's poise under pressure — emergencies, crowds, criticism. Compare with 镇定自若 (zhèndìng zìruò), which is nearly synonymous but emphasizes 'staying calm' rather than 'natural ease.'
memory
Break it down: 泰然 (tàirán, 'at peace') + 自若 (zìruò, 'as one's usual self') = behaving exactly as you normally would, no matter what's happening around you.