3 sentences

1. 那个偏远的山村交通非常闭塞。

   nà gè piān​yuǎn de shān​cūn jiāo​tōng fēi​cháng bì​sè.

   That remote mountain village is very isolated in terms of transportation.

   Source: Dong Chinese Dictionary

2. 由于血栓，这条血管已经闭塞了。

   yóu​yú xuè​shuān, zhè tiáo xuè​guǎn yǐ​jīng bì​sè le.

   Due to a blood clot, this blood vessel is blocked.

   Source: Dong Chinese Dictionary

3. 由于网络不通，这里的人们消息非常闭塞。

   yóu​yú Wǎng​luò bù tōng, zhè​lǐ de rén​men xiāo​xi fēi​cháng bì​sè.

   Because there is no network, the people here are very out of the loop.

   Source: Dong Chinese Dictionary