closely linked to 与密切相关；同…密切联系

【例句】

In addition, most allergens are closely linked to human living environments and are impossible to simply wipe out.
此外，大多数过敏原与人类生活环境密切相关，不可能简单地根除。

Exhibition industry is closely linked to the social and economic development.
会展业与社会和经济发展是紧密相联系的。