21.   Downs said the removal of the bolts and the installation of the wire required some knowledge of how the railway system works.

22.   Improved predictions require better knowledge of the very fine-scale interplay of temperature, moisture and wind that converts a mesocyclone into a tornado.

23.   In contrast, many other predictive analysis techniques require sophisticated knowledge of programming and statistics.

24.   It is aggressive, complex, requires specialized knowledge and can be very high tech.

25.   It was of an ambitious young man who, after the Depression, concluded that success required knowledge.

26.   Most of the jobs required some knowledge of English.

27.   Mounting any defense against them requires more knowledge about their composition, Yeomans said.

28.   Part of the attraction is that the proposed credential does not require knowledge of all the complex accounting principles the CPA exam requires.

29.   Requires no knowledge of electronics.

30.   Requires basic knowledge of online tools and company policies.