The training program is mainly undertaken by civilian instructors.

Her education was mainly undertaken by her mother, with occasional instruction from tutors.

Fieldwork was undertaken mainly by birders, and most of it was done voluntarily.

Manufacture of action parts for their organs is now undertaken mainly by handicapped people.

Logging is undertaken mainly for house building materials.

The study is mainly undertaken as full-time morning classes.

The work of building the Smith was undertaken mainly by local contractors with a couple of exceptions.

This kind of tourism, which is undertaken mainly by large numbers of senior citizens, is just as important.

However, let me remind you that the agreement deals with rather large procurement contracts which are mainly undertaken by big companies.

Initiatives have been undertaken mainly at the level of individual classrooms and schools.