"fragile boundary" is a correct and usable phrase in written English.
You can use it to describe a point of division that is easily disrupted or broken. For example, "The fragile boundary between our two countries was threatened by increased conflict."
The web has blown apart the fragile boundary between the two, making our homes into marketplaces where we are expected to trade ourselves.
But it was difficult not to see, in McDonnell's fall, a test of the fragile boundary between the conduct that sends a man to jail and the behavior that helps him get reëlected.
"Birdwatchers," for its part, is very much about the land in which it takes place — an area of the Amazon where forest gives way to fields and pastures, and where the native Guarani are being displaced by ranchers and farmers — and its central dramatic conflict is summed up in aerial shots that show the fragile boundary between wilderness and cultivation.
The many readers of Ms. Sebold's novel, however, might have very different expectations: her tale of the premature ghost Susie Salmon (played in the movie by Saoirse Ronan of "Atonement") isn't really a horror story, but a kind of dreamy meditation on the fragile boundary between life and death.
On the other side, however, if epigenetics certainly undermines the naïve separation of nature and nurture, at the same time, in breaking this fragile boundary around which much of the twentieth century episteme of the social and human sciences was constructed, it brings to light an entire new set of conceptual problems.
And, like Musk, he's trying to use his personal wealth to ensure the future of humanity by enabling it to expand beyond our planet's fragile boundaries.
In my Los Angeles Times review of " China Syndrome: The True Story of the 21st Century's First Great Epidemic," I tried to depict the fragile boundaries between human, animal, and viral wildlife.
The more fragile that boundary gets, the more fretful we grow.
Most fragile sites boundaries have not been characterized yet.
As a final note we emphasize that most fragile sites boundaries have not been characterized yet and are not known.
Psychoanalytic theory emphasizes that the human organism is constantly, though slowly, changing through perpetual interactions, and that, therefore, the human personality can be conceived of as a locus of change with fragile and indefinite boundaries.
