/ˈfɒstə/
[T] ~ sthto encourage sth to develop 促进；助长；培养；鼓励 SYN encourage, promote
The club’s aim is to foster better relations within the community.
俱乐部的宗旨是促进团体内部的关系。
[T, I] ~ (sb)(especially BrE) to take another person’s child into your home for a period of time, without becoming his or her legal parents 代养，抚育，照料（他人子女一段时间）
They have fostered over 60 children during the past ten years.
在过去十年间，他们抚育了 60 多个儿童。
We couldn’t adopt a child, so we decided to foster.
我们不能领养孩子，所以决定代养一个。