Sentence examples for this is a main source from inspiring English sources

Indeed, there are differences related to the age and gender of the studied animals; moreover, blood sampling procedures differed among studies, and this is a main source of variability in reference values [5].

The atlas-axis articulation may also have had limited flexion, despite proposals that this was a main source of flexibility in the azhdarchid neck [24], [29].

The fund is a main source for financing.

Medicinal plant is a main source of cancer drug development.

This appears to have been a main source of entertainment for the young Barry – apart from the radio, on which he first heard music, and knew immediately that he would become a composer, though he hadn't yet heard the word.

This suggests that physicians may be a main source of participants' social support.

In this review, however expert opinion was a main source of data, which makes the validity of conclusions difficult to ascertain.

(Kenya NGO 014) International partners were a main source of evidence in this case as well.

Widespread demand for psychoactive drugs is mainly serviced through illegal supply in which organised crime is a major player: this is the main source of funds for many criminal groups, such as Albanian, Turkish and Russian mafia, Chinese Triads and the Japanese Yakuza.

Adams said for most of the officials who call 60 or more games a year, this is their main source of income.

The John Compton Dam is not functioning due to a landslide, and as this is the main source of water for the people of St. Lucia there is strict water rationing in effect.