Evidence from a 1997 study at the University of California shows that several patients who received such substances were able to produce their own natural drug.
1997年加利福尼亚大学的一项研究表明，一些接受了这种物质的病人能够产生他们自己的天然药物。
2
In wider and more difficult areas of life, there is evidence to indicate that natural surroundings improve all kinds of things.
在更广阔，更艰难的生命领域中，有证据表明自然环境可以改善各种事情。
3
That natural smile is clearly in evidence as she moves from customer to customer, helping them find the right train, or pay the right fare for their tickets.