"several key ways" is correct and can be used in written English.
You might use this phrase to indicate to the reader that you are about to discuss several different methods of achieving a particular goal. For example, "There are several key ways to reduce energy consumption in the home."
That's because in several key ways, Japan was much better equipped to withstand its financial lashing in the 1990s than Americans are today.
Like The Sopranos, which it resembles in several key ways, the writers have invested as much energy in character studies as in plot development.
Even though Mr. Blagojevich's trial differs from Mr. Kelly's in the charges and the venue, the closing arguments could be similar in several key ways.
Cognitive psychologists have identified several key ways in which individuals retain and share the information they hear on a daily basis.
The show departs in several key ways from the true story, blurring chronology and conflating characters, and adding in one or two questionable twists for the sake of drama.
As Kawaoka explains, his experiment differs in several keys ways from one led by the lab of Ron Fouchier at Erasmus MC in Rotterdam, the Netherlands.
Our work highlights several key problems in the way this has been carried out, and may explain many opposing or non-confirmatory studies in this area.
As described previously [ 26], there are several key differences between the way the databases represent the notion of a pathway: KEGG pathways are a kind of mosaic of similar pathways predicted in different species; in MetaCyc, the overall reactions in a pathway are supposed to occur in a defined group of species.
Opponents hope the government will eventually be forced to give way on several key clauses, including abandoning plans to cut legal aid for patients pursuing clinical negligence claims and introducing an independent appeals system against decisions to refuse legal aid.
Bremner says several key challenges stand in the way: First, men generate millions of sperm per day compared to the typical single egg a woman produces each month.
