从容不迫
Take things easy.
Take one's time.
Cool as a cucumber.
eg:No matter how difficult the job be, john always takes things easy and does it well.
中英俚语俗语来源:史记:“良尝闻从容步游下邳圯上。”
同义词:慢条斯理 Make two bites of a cherry.
反义词:迫不及待 Eat the calf in the cow's belly.