11.   Much more research must be done, though, to understand specifically how the barrier mechanism works.

12.   The feedback mechanism works by drying the soil, which allows the scorching sun to make the soil hotter than if it were moist.

13.   The mechanism still works.

14.   The market mechanism is working.

15.   The mechanism has not worked perfectly and there is clearly room for tightening the system.

16.   The real sticking point for any theory about a synergy between art and mental illness is explaining how the mechanism works.

17.   The standard explanation of how the transport mechanism works is known as the Levine effect, and it opened up subsequent work on how hormones modify cell functions.

18.   But analysts are not quite sure how the guarantee mechanism will work.

19.   Dr Lim also explained how the mechanism worked.

20.   That mechanism works well when food supplies are uncertain, but when food is plentiful, such as in modern America, it can result in obesity.