The fact that children tell lies is a sign that they have reached a new developmental stage.

孩子们说谎就表明他们已经进入了一个新的发展阶段。

The product is still at a developmental stage.

这种产品仍处于研制阶段。

Developmental stage returned from mature: type to juvenile type.

发育阶段从老态回复到幼态。

When fetus is about 3 cm long, fetal embryos is in foetal developmental stage.

此时胎儿大约3厘米长，胚胎进入到了胎儿发育阶段。

The programmed expression of globin genes is tissue and developmental stage specific.

珠蛋白基因的程序性表达是组织发育时期专一性的。