The phrase "a key export" is correct and usable in written English.
It can be used to refer to an important product or commodity that a country or region sells to other countries.
Example: "Agriculture is a key export for many developing nations, providing essential revenue for their economies."
Alternatives: "a major export" or "an important export".
It is a key export and therefore a brand we need to protect.
It is proof that Britain's creative industries are a key export sector, which we can and should be growing.
In addition, a key export market for the United States -- Southeast Asia -- wilted after the economic crisis there.
Eventually, Islay's distillers were forced to pay tax, and whisky became a key export, produced more for mainlanders than for locals.
But the IEEFA analysis shows that the wholesale cost of electricity in India, a key export market, is half that of Galilee coal-fired power, making it financially unattractive for the Indian government.
Lee So-yeon, a North Korean army defector who arrived in Seoul in 2008, said fish products are a key export for North Korea's army, which hires civilian fishermen to make money.
India's factory owners have been going through a tough time recently, with challenges in the domestic economy and a slowdown in key export markets including Europe and the US.
However, they have been under pressure lately amid a slowdown in key export markets as well as China's own economic growth.
Britain's manufacturers have been feeling the effects of a slowdown in their key export market of the eurozone.
Reasons given by panellists for June's fall in new export orders included unfavourable exchange rate movements and a lack of demand in key export markets.
It cautioned that a slowdown in Beijing's key export markets and "the ongoing correction in China's property markets" were key risks to growth in the future.
