1. The mere fact that ticket sales in recent years for screenplay-based movies have exceed those for book-based movies is insufficient evidence to conclude that writing screenplays now provides greater financial opportunity for writers.

结构：The mere fact that … is insufficient (inadequate/scant) evidence to conclude that …

The EU has prohibited imports of many varieties of GM cereals and has put on hold the expansion of commercial plantings of genetically modified crops in some member states. It argues that there is insufficient scientific evidence to conclude there is no risk to consumers from genetically modified foodstuffs, or to the environment from such crops. It has invoked the "precautionary principle", which is a fancy term for a simple idea: better safe than sorry. (the Economist, “A Survey of Agriculture and Technology”, March 25, 2000)

出处：Argument 220

翻译：这几年，由电视剧改编的电影比由小说改编的电影票房收入高，仅仅是这一事实并不足以说明作家靠写电视剧本就能过上好日子。