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Английский тезаурус
obstacle ['ɔbstək(ə)l] сущ.
авиац., Канада.	All fixed whether temporary or permanent and mobile objects, or parts thereof, that are located on an area intended for the surface movement of aircraft or that extend above a defined surface intended to protect aircraft in flight
воен., логист.	An obstruction designed or employed to disrupt, fix, turn, or block the movement of an opposing force and to impose additional losses in personnel, time and equipment on the opposing force. Obstacles can exist naturally or can be man-made, or can be a combination of both. (FRA)
воен., сокр.	obs; obst
США.	Any natural or man-made obstruction designed or employed to disrupt, fix, turn, or block the movement of an opposing force, and to impose additional losses in personnel, time, and equipment on the opposing force (JP 3-15)
obstacles сущ.
воен., логист.	Installations, works and demolitions designed to prevent or hinder the movement of forces. They are put in place in order to inflict losses on the enemy, to delay or hamper his movements and actions, to restrict his manoeuvres or to force him to advance in a direction favourable to friendly forces. They may be subdivided by type into explosive, non-explosive, electrified and combined obstacles, by location and purpose into land, air or sea obstacles and by scale into operational or tactical obstacles. (UKR/NATO)

obstacle : 3 фразы в 3 тематиках

Общая лексика	1
Торговля	1
Экономика	1