adj.隔夜的

He is seventy if he is a day old. 他该有七十岁了。

The piglet is one day old and crippled. 这只残疾的小猪刚出生一天。

The researchers injected the lectins into eighteen day old embryos. 研究员将这个血凝素注射到有十八天的晶胚里。

One day Old Stony Phiz set out on a visit to the valley where he was bor. 有一天，老石面出发了来到他出生的峡谷来访问。

A primary culture of myoblasts may be prepared by excising skeletal muscle tissue from 10to 30 day old rat embryos. 制备成肌细胞的初级培养物，可以将10-30天的大鼠胚胎骨骼肌组织剪切下来。