"certain phase" is a correct and usable phrase in written English.
Example: We are in a certain phase of our relationship where we need to be honest with each other.
During a certain phase in my life film was a substitute for religion".
The artist should have the right to identify his work with a certain phase of his development.
We do not actually multiply each antenna signal with a cosine shifted by a certain phase term, because creating and mixing that many signals would be expensive.
And here is with a stimulus turned on, and you can see that the spikes line up during a certain phase or part of the stimulus waveform.
Thus, one drug may be used to stop the growth of cancer cells in a certain phase, while another agent may work at a different phase.
Updike: That poem was perhaps the longest piece of light verse The New Yorker ever printed, and it is a poem I'm proud of as representing a certain phase of my productivity.
Once plants have reached a certain phase of development, which happens earlier when winter is warm and spring is early, they are extremely fragile and susceptible to freezing temperatures.
In order to determine information about a certain phase of a material, the need for a method that offers an objective evaluation is necessary.
Most of these challenges can be assigned to a certain phase in the development, while some of them appear in the entire life-cycle of a PSS.
