1.   In the case of horizontally separated zones and certain types of racking this would be particularly difficult by normal means of observation.

2.   The political process in such an organization is made even more difficult by the fact that there is little communication.

3.   The problem of tracing the invention of enamel is made more difficult by failing to distinguish it more certainly from glass.

4.   The somber job was made more difficult by driving snow and subfreezing temperatures.

5.   The links were often circuitous, narrow and made more difficult by differing levels.

6.   As they walked back to the clubhouse with the Vice-Captain, conversation was made difficult by the roar and whirr of a helicopter hovering over the field behind.

7.   Interpretation of the studies involving surgery is made very difficult by the problem of anatomical and functional changes caused by the surgical procedure itself.

8.   This is made more difficult by the speed at which new stores are now built.