A smile, a wave and a friendly attitude can break down any barrier and create friendships where language cannot be understood.

笑容、挥手与友好的态度，可以跨越任何形式的障碍，即便在语音不通的情况下，也可以建立友谊。

youdao

Saliva acts as a barrier, protecting the teeth by neutralising acidic foods such as oranges, and the acid produced by bacteria as they break down foods.

而唾液正像一道保护牙齿的屏障，把橘子等酸性食物以及细菌分解食物产生的酸性物质中和掉。

youdao

We talked about the handset's delightful zero-gap aluminum and plastic unibody and how HTC wanted to "break down that last barrier" of integrating antennae in a metal casing without making compromises.

ENGADGET

If we encourage the young people around us to fight every single day for what they know is right, if we break down any barrier that stands in the way of a young woman getting her education or believing she can achieve her dreams, then I am confident that we will finally unlock the promise of our next generation.

WHITEHOUSE: The White House