the meaning of "trade" can mean a specific industry or business. This meaning can be applied to the phrase "opportunities in the building trade".
Explanation:
Conventionally the word "trade" means the activity of selling and buying products, but that word can have other meanings. These meanings are also related to the activity of selling and buying, but it can also be related to the activity of producing and even, it can be related to industry or a particular business.
The sense of "industry" that the word "trade" carries can be used in the phrase "opportunities in the building trade", showing that the building can present an opportunity to build a business, an industry.
