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"was firstly reported" is a correct and usable phrase in written English.
It can be used to describe the first mention of something in the past, such as news, a discovery, an event, etc. For example, "The outbreak of the virus was firstly reported in China in late December 2019."
Exact(44)
A novel method of preparing cube-like MnO2 by MnCO3 was firstly reported.
A new structure-directing agent (SDA) was firstly reported for the synthesis of a zeolite LEV analogue.
Carboxymethyl chitosan (C-CTS) was firstly reported as a water soluble binder for LiFePO4 cathode in Li-ion batteries.
A brief of experimental result on the dynamic response of blast-loaded sandwich shells was firstly reported.
The introduction of diatomite in hydraulic lime mortars as a waterproofing barrier was firstly reported in licensed architectural plans after 1945 in the central region of Portugal.
Here, the cathodic electrochemiluminescence (ECL) behavior of 3,4,9,10-perylenetetracar-boxylic acid (PTCA) coreacted with hydrogen peroxide was firstly reported.
Similar(16)
All the synthesized compounds were firstly reported.
Magnetic-field induced alignment of polyethylene is firstly reported.
The synthesized NiCo2O4 mesoporous spheres (MS) displayed intrinsic peroxidase and oxidase-like activity were firstly reported.
Herein, a three dimensional (3D) Na3V2(PO4)3–based hollow nanosphere with hierarchical pores (3DHP NVP@C) has been firstly reported.
Photoelectrocatalytic (PEC) inactivation of Escherichia coli K-12 by cuprous oxide (Cu2O) film irradiated by visible light is firstly reported.
More suggestions(15)
was originally reported
was partly reported
was mostly reported
was before reported
was essentially reported
was previously reported
was only reported
was second reported
was initially reported
was specifically reported
was ultimately reported
was formerly reported
was early reported
was primarily reported
was immediately reported
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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