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по мере надобности (You can strain the oil through cheesecloth on an as-needed basis, leaving the remaining herbal oil to continue steeping. Sweeterbit); в случае необходимости (Alex_Odeychuk) | |||
при необходимости (Candidates may be expected to work overtime, including weekends, and to travel on an as-needed basis. dumb rabies) | |||
по мере необходимости (bookworm) | |||
по вызову (о работе; иногда встречается в таком значении 4uzhoj) | |||
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в зависимости от потребности |