The phrase "has been firstly designed" is correct and usable in written English.
You can use it to indicate that something was designed first or was the first thing designed when compared to other things. For example, you could say: "This innovative new device has been firstly designed to reduce energy usage in the home."
Through the investigation of an academic definition of ecosystem, its explanation in terms of urban logistics followed by its application to case studies, such a framework has been firstly theoretically designed and then some application examples are given.
The volume-of-solid (VOS) method presented by Cheng and Chen [20] for homogeneous and isotopic materials shape design has been firstly applied to deal with the composite materials.
The TBCs samples with a pre-delamination were firstly designed and they had been successfully prepared by air plasma sprayed technique.
In order to further improve the accuracy of seam tracking, in this paper, a set of special vision system has been designed firstly, which can acquire clear and steady real-time weld images.
Firstly, a tribometer has been specifically designed to measure wear coefficient, and punch worn profiles have been extracted by means of a double-print method.
Firstly, the Regional Growth Fund has been specifically designed to encourage and support investment away from London and the South East.
A novel single-armed Salamo-type bisoximes (H3L) has been designed and synthesized firstly.
Firstly, you want your guests to feel as though the space has been thoughtfully designed with their needs in mind.
The experimentation has been designed as two steps: firstly, the normal male and female mice were compared with male and female C57-AMPK gene knocked-out mice, respectively; then the differences between male C57-AMPK gene knocked-out mice and female C57-AMPK gene knocked-out mice were further detected.
Firstly, since the instrument has been designed a posteriori, the question stems, response options and time frame of the questions were not identical to those from the DEMQOL framework.
