尽管存在语言障碍，他们很快就成了好朋友。

Despite the language ___barrier, they soon became good friends.

害羞是交友的最大障碍之一。

Shyness is one of the biggest ___barriers to making friends.

我们必须努力消除两个社区之间的隔阂。

We have to work at breaking down ___barriers between the two communities.