The phrase "a certain mastery" is correct and usable in written English.
It can be used to describe a specific level of skill or expertise in a particular area or subject.
Example: "After years of practice, she achieved a certain mastery in playing the violin."
Alternatives: "a particular skill" or "a specific expertise."
He had a certain mastery and he gave occasional intimations of power in reserve, but his poems bored me stiff.
"But when you think about all the things you learn outside a classroom — riding a bike, sports, playing an instrument — what you want to achieve is a certain mastery".
The tobacco bill, for example, is needed because "3,000 kids will start smoking every day, and 1,000 of them will die from smoking-related illness".. And, for all the tilting at windmills, he has a certain mastery of the political process: campaign-finance reform, for example, was sustained as an issue long beyond the patience of Mr Lott and the House Speaker, Newt Gingrich.
If Davis is to have a chance to beat Abbott, a certain mastery of Texas media will be required, and instead there has been an exhibition of failure.
Risk agility implies a certain mastery of risk, decision making under opacity, and a level of simplicity in the face of complex, heavily interconnected systems.
I must confess: I have achieved a certain technical mastery in the art of staring straight ahead".
Moving through the episodes require certain mastery criteria and is automatically mapped in a board game like screen that allows the learner to monitor their own progress.
Like skiing, it requires a certain degree of mastery, a countervailing ability to contend with the panic and reassert a measure of stability.
Some games level that a little with dynamic difficulty, but basically, the entire structure is, 'here's a skill, practice it and we'll only let you progress once you've demonstrated a certain level of mastery'.
Students take Capstone Courses in order to plan and carry out a specific research project; synthesize their diverse educational interests; achieve a certain level of mastery in their area of focus in theater, dance, or performance studies; or add a significant accomplishment to their résumés so that they are well prepared to enter the professional world after graduation from UC Berkeley.
