The phrase "a long trough" is correct and usable in written English.
It can be used to describe a lengthy depression or hollow in a surface, often in contexts related to geography, economics, or physical objects.
Example: "The landscape was marked by a long trough that stretched across the valley, creating a unique topographical feature."
Alternatives: "an extended depression" or "a lengthy hollow".
The fall means real incomes in Britain are continuing to rise (after a long trough when wages didn't keep pace with prices).
In conventional solar-thermal plants such as Solel's, a long trough of parabolic mirrors focuses sunlight on a tube filled with a heat-transfer fluid, often some sort of oil or brine.
The Gulf of St. Lawrence is included in this group, though it is really intermediate between groups A3 and B. It contains both a pronounced shelf and a long trough up to 530 metres (1,740 feet) deep.
The lakes east of the Andes formed in a long trough created when the immense weight of that growing mountain chain pressed Earth's crust downward, Sacek says.
After going through Cuban immigration and customs, we docked at Canal 1, a long trough similar to the limestone-cut canals of South Florida.
It existed at a fairly low latitude and failed to intensify due to the unfavorable combination of Hurricane Ginger and a long trough to its northwest.
But this could be a painfully long trough.
The approximately 25 km long trough valley covers an area of 151.43 kMunicipal Government Safienfien 2014), and is enclosed to the south, east, and west by about 2,000 3,000 m high mountain ridges and in the north by the Rhine Gorge.
Asheville, which was spared damage from Hurricane Matthew, has rebounded from a long economic trough in recent decades.
First he makes a mold out of silicon; a long, straight trough in the silicon serves as a mold for half of a tube, for example.
Nearby, a long steel trough descends from the last dig that was made into "belly veins" where miners had to crawl through small tunnels to claw away boulders of coal, usually mixed with other rocks, which then thundered down the chute to be loaded into the coal car for transportation to the tipple at the surface.
