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The phrase "are obstacle" is not correct in English.
Did you mean "are obstacles"? If this is the case, you can use it when describing something that serves as a hindrance or barrier to progress or achievement.
Example: "The lack of funding and resources are obstacles to the project's success."
Alternatives: "are barriers" or "are hindrances".
Dictionary
are obstacle
noun
Something that impedes, stands in the way of, or holds up progress
Exact(12)
Roughly half of these are obstacle races.
'Let's face it', thinks Jack as he frets about a lover's incompatibility, 'people are obstacle courses'.
Crowded hallways are more crowded, and classroom aisles are obstacle courses.
There are no big resorts or shopping malls, and the rare paved roads are obstacle courses of people, pot-holes and livestock.
Among the most basic are obstacle avoidance and wall-following.
Some examples are: obstacle free zone, rumble strips, reflecting road markings, protective shoulder.
Similar(48)
But there are obstacles.
Still, there are obstacles.
There are obstacles.
Even so, there are obstacles.
But there are obstacles, too.
Write better and faster with AI suggestions while staying true to your unique style.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com