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In any problem of major importance it is good to have a diversity of approaches.

A variety (or A number) of techniques are used.

During the past half-century physicists have built a succession of particle accelerators.

With solution chromatography, a large (or great, or wide) variety of detection techniques have been employed.

The instrument will serve a broad range of astronomical purposes.

Источник: Русско-английский научно-технический словарь на Gufo.me