backyard
noun [ C ] uk/ˌbækˈjɑːd/ us/ˌbækˈjɑːrd/
UK后院，后庭
a small space surrounded by walls at the back of a house, usually with a hard surface
The house has a small backyard, surrounded by a high brick wall. 这座房子有个小小的后院，用高高的砖墙围着。
B1 US（屋后的）场院，院子;后花园
a space at the back of a house, usually surrounded by a fence, and covered with grass
The kids were playing in the backyard. 孩子们正在后花园里玩耍。
Idiom
in your backyardidiom informal 在自家后院;在自己的住所;在自己的兴趣（或活动、责任）范围内
in the area where you live, or in the area of interest or activity that you are involved in or responsible for
How would you feel about them building a nuclear power station in your backyard? 如果他们在你家后院建核电厂，你会有什么感觉？
We should take a look at what is happening in our own backyard before criticizing what is taking place in other countries. 在批评别国的事情之前，我们应该先看看自己国内发生的事情。