从容不迫的leisured unhurried

从容不迫地by easy stages

粗枝大叶careless slapdash sloppy

粗枝大叶的broad-brush

措手不及unaware unprepared

错综复杂、扑朔迷离 anfractuosity

错综复杂的anfractuous daedal reticula sinuous

打草惊蛇act rashly and alert the enemy

大材小用waste one’s talent on a petty job

大公无私selfless

大海捞针look for a needle in a bottle of hay

大惑不解be extremely puzzled

大惊小怪a storm in a teacup/foofaraw/fuss/like a hen with one chicken

大惊小怪的spoffish

大快人心affording general satisfaction

大名鼎鼎famous well known

大器晚成great minds mature slowly

大千世界the boundless universe

大失所望greatly disappointed

大同小异largely identical but with minor differences