不把…当一回事;对…等闲视之;觉得…无所谓
think nothing of sth / of doing sth
to consider an activity to be normal and not particularly unusual or difficult
She thinks nothing of walking thirty miles a day.她认为一天步行三十英里不足为奇。
释义来自《牛津高阶英汉双解词典》第 9 版