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Discover LudwigThe phrase "alternately substituted" is correct and usable in written English.
It can be used when describing a situation where two or more items are replaced in a back-and-forth manner.
Example: "In the experiment, the chemicals were alternately substituted to observe the effects of each one on the reaction."
Alternatives: "interchangeably replaced" or "swapped in turn".
Exact(2)
Structurally, it is a close analog of the carbon nanotube, namely a long cylinder with diameter of several to hundred nanometers and length of many micrometers, except carbon atoms are alternately substituted by nitrogen and boron atoms.
In general, the arabinans consist of a linear chain of α-1,5-linked arabinofuranosyl residues that may be alternately substituted at the O-3 and/or O-2 with additional arabinofuranosyl residues.
Similar(58)
36 The main institutional response to low HIV testing has been to focus on the expansion of clinic-based testing using two approaches: (1) increase the number of sites – fixed and mobile – in which people are offered VCT services, and (2) to substitute what is alternately referred to as provider-initiated, routine, or opt-out testing for more traditional VCT approaches.
Caitlin Burke was an alternately regal and cartoonish Katisha; David Wannen was a rich-voiced if slightly leering Mikado; and Ed Prostak, substituting at the last minute for a snow-bound David Auxier, sang solidly as Pish-Tush.
Substituting Eqs.
Then substitute.
Alternately blistering and soaring.
"Or, alternately, carpal tunnel surgery.
(And, alternately, freshly churned butter).
Alternately: Write what interests you.
Nick Kyrgios alternately blazed and imploded.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com