Firstly, the system barrier must be eliminated, urban-rural laborers' rights and interests should be defended, and they should be given more rights and opportunities to participate in community.

首先，要消除制度壁垒，切实维护农民工的各项权益，扩大农民工社区参与的权利、机会。

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You accept color differences, affirm them, celebrate them, but don't allow them to become a barrier to human community, " said Baldwin, author of a new King book, "In A Single Garment of Destiny: A Global Vision of Justice.

NPR: King 'Content Of Character' Quote Inspires Debate

Simultaneously, the construction of sewage channels and the Gowanus Expressway on the community's eastern edge created a physical barrier between Red Hook and the rest of Brooklyn, crippling the already struggling community further.

BBC: A remote hook in New York��s harbour

As string theory involves intricate mathematics, the barrier to entry into its community is high.

ECONOMIST: Theoretical physics