never to slacken morning or night; busy morning and night; never idle; non-stop from morning to night
Example Sentences:
1.
Under their vigilance , the prisons are relatively safe and secure , and serious physical violence is a rare occurrence 他们夙夜匪懈，使监狱相较其他地区来得安全而保安严密，罕有严重暴力事件发生。
2.
David abreu , the tireless viticulturalist consults for some of california ’ s finest producers , who recognize his perfectionist attitude in planting and maintaining vineyards 大卫?雅布，这名夙夜匪懈的葡萄园管理师替许多加州最知名的酒庄管理庄园。
