early前面加什么介词

前面加介词at，例如：

1、The enemy opened fire on our lines at early dawn.拂晓时敌人向我阵线开了火。

2、Children of educated and upper-middle-class parents turn out to be far more curious， even at early ages， than children of working class and lower class families.父母是受过教育和中上阶层者，其孩子远比工人阶层和下层家庭的孩子们更好奇，甚至在很小的时候就有这样的差距。

3、It's that west-coast-soul kind of vibe you get looking at early Prince photos.只有在看早期的王子图片时你才能看到的西海岸的那种氛围。