It was only after “toddler” became a common shoppers’ term that it evolved into a broadly accepted developmental stage.
直到“幼儿”一词成为常见购物者术语之后，它才演变为一个被广泛接受的发展阶段。
Radesky cites the “still face experiment” devised by developmental psychologist Ed Tronick in the 1970s.
拉德斯基引用了发展心理学家埃德·特罗尼克在20世纪70年代设计的“静止面孔实验”。
例句取自历年考研英语真题，翻译为机器生成，仅供学习参考。