2 sentences for 封闭 (fēng​bì — isolated)

1. 水都是在封闭的系统里循环的。

   shuǐ dōu shì zài fēng​bì de xì​tǒng lǐ xún​huán de.

   Water circulates in a closed system.

   Source: OpenSubtitles

2. 这个偏僻的村庄处于一种相对封闭的状态。

   zhè gè piān​pì de cūn​zhuāng chǔ​yú yī zhǒng xiāng​duì fēng​bì de zhuàng​tài.

   This remote village is in a state of relative isolation.

   Source: Dong Chinese Dictionary