Miànduì kùnnán, tā shèng sì xián tíng xìn bù, yīdiǎn yě bù jǐnzhāng.
Facing difficulties, he was as calm as on a garden stroll — not nervous at all.
Tips
history
From Mao Zedong's 《水调歌头·游泳》 (1956), describing his swim across the Yangtze: 不管风吹浪打,胜似闲庭信步。今日得宽馀。 The line pairs physical struggle against the river with the calm of a home-garden stroll — bravado that became a political catchphrase.
usage
Modern use is mostly sporting or rhetorical — to describe someone who handles a tough situation with evident ease. Pair with 不管风吹浪打 for full rhetorical force.