en alternance avec

listen to the pronunciation of en alternance avec
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alternately
By alternation; when, in a proportion, the antecedent term is compared with antecedent, and consequent
In reciprocal succession; succeeding by turns; in alternate order
{a} mutually, by turns
in an alternating sequence or position; "They were deglycerolized by alternately centrifuging and mixing"; "he planted fir and pine trees alternately
interchangeably, in rotation, with one and then the other