B1 being the oldest of three or more people, especially within a family(尤指某一家庭中3个或3个以上的成员里)年龄最大的
More examples
When the queen dies, her eldest son will succeed to the throne.
Maria brought along her eldest daughter - a lovely girl with brown eyes and a ready smile.
B2 a person who is the oldest of three or more people(3个或3个以上的人中)年龄最大的人
the oldest child in a family长子;长女
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