障碍 ?:

In today’s session, we’re going to look at how to meet future goals and overcome present obstacles at work.

The most difficult thing about moving to a foreign country is the language barrier.

raise, lower a barrier

Barriers have been erected all along the route the Pope will take. | 2. The mountains acted as a natural barrier to the spread of the disease.

Despite the language barrier (= not speaking the same language), they soon became good friends. | 2. Shyness is one of the biggest barriers to making friends (= something that makes this difficult).