1.   Already we have a few examples of the end-product of several stages of processing, although we do not yet understand the mechanisms.

2.   Although the mechanism is not understood, mental stress also seems to make eczema and urticaria worse.

3.   But we have to understand the mechanisms they are using in order to help them develop new and more flexible behaviors.

4.   In order to understand the mechanisms governing ribosome biosynthesis, it is necessary to elucidate the structure and organization of its components.

5.   It is difficult to understand the mechanisms of the network as a whole.

6.   Astrophysicists believe they understand the mechanism in complete detail.

7.   But because smell is not the most precise of human senses, charting the decline in ability, let alone understanding its mechanism, has been difficult.

8.   But more research is needed to better understand the mechanism, Yusuf said.

9.   Molecular genetists may understand the mechanism of human learning before computer scientists do.

10.   Picker and McClatchy clearly understand the mechanisms of opera, but there are times when operatic compression exacts a cost.