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when the need arises stresses
comp.	при возникновении необходимости (This would entail participating in its meetings and activities, providing information and advice and exercising good offices when the need arises. RealMadrid)
law	по мере необходимости (Leonid Dzhepko)
when as, if the need arises
gen.	по мере в случае необходимости

when the need arises: 1 phrase in 1 subject

General

1