The benefit of shooting the gas straight into the combustion chamber is twofold.
From the washingtontimes.com
With the discovery of previously hidden land, national income increased twofold.
From the en.wikipedia.org
The reason that negotiations in Brussels are currently so protracted is twofold.
From the thisismoney.co.uk
The number of livestock and poultry has decreased twofold compared to the 1990s.
From the en.wikipedia.org
Second, Smyth introduced a twofold church leadership, that of pastor and deacon.
From the en.wikipedia.org
Hers is twofold, and she has stressed both long before she took part in pageants.
From the kansas.com
The idea behind adopting it for the season's first major was twofold, Payne said.
From the newsobserver.com
In the fourth quarter of the last fiscal year, the figure rose more than twofold.
From the forbes.com
They demonstrated that stronger bonding produced a twofold increase in heat flow.
From the sciencedaily.com
More examples
By a factor of two; "the price increased twofold last year"
Double: having more than one decidedly dissimilar aspects or qualities; "a double (or dual) role for an actor"; "the office of a clergyman is twofold; public preaching and private influence"- R.W.Emerson; "every episode has its double and treble meaning"-Frederick Harrison
Double: twice as great or many; "ate a double portion"; "the dose is doubled"; "a twofold increase"