"major activities" is a correct and usable phrase in written English.
It can be used to refer to significant activities or tasks that need to be completed. For example: "The Mayor's office oversees several major activities related to the city's infrastructure."
JPMorgan fared well in major activities like advising on deals and stock and bond sales.
Bird-watching, hiking, star-gazing and nature walks are major activities in the park, Mr. Whatley said.
Transportation, services, and extensive wholesale trade are also major activities, and riverboat casino gambling contributes to the economy.
The major activities of early humans were the hunting and gathering of food and the care and rearing of children.
Second, Eskom identified the sources of impact with respect to its three major activities: building new facilities, operating these facilities and, ultimately, providing electricity to South Africans.
After a few days, he had a promising prototype and a better title: a compound of words that highlighted the game's major activities, mining holes and crafting buildings.
Women may have to get the permission of their male "guardians" to drive, as they do for many major activities in their life.
In industry, major activities include printing and publishing; food processing; and the manufacturing of electrical and electronic goods, automobiles, pharmaceuticals, and mechanical products.
"We need to have a good understanding of major activities related to nuclear issues," Mr. Amano said of his investigations of the Iranian program.
It consists of two major activities: problem decomposition and application structuring.
In addition to cultivation, livestock rearing and trade are major activities in the state (KNARDA 2006).
