"hidden phenomenon" is a correct and usable phrase in written English.
You can use it to refer to an event or circumstance that is not immediately obvious or well-known. For example, "The hidden phenomenon of climate change has become a growing concern in recent years."
Reporting by the Guardian has revealed that self-induced abortions are a significant, if hidden phenomenon in America.
In such a hostile climate, it is no wonder that self-induced abortions are still a significant, if largely hidden phenomenon – one that even pro-abortion rights groups are only just beginning to grasp.
Yet, violence against children remains a largely hidden phenomenon.
Because such violence is more often committed by those duty bound to protect children, it remains a largely hidden phenomenon.
Because such violence is more often than not committed by those duty bound to protect children, it remains a largely hidden phenomenon.
By image processing of dipping process based on Otsu's method, it was found that low-viscosity flux glue eliminates the micelle effectively, very low speed also leads to small micelle hidden between the bumps, and this small micelle and hidden phenomenon disappeared when the speed is ≥0.2 cm s−1.
However, despite the strong development of the concept of creative economy and its broad impact in political and academic circles, the literature on the creative economy, creative classes and creative cities has been criticized both for its conceptual definition and character asepticsuch as for responding to interests of certain economic groups or hide phenomena of urban segregation.
Then, an acceleration helix layout of markers is proposed to solve the markers hidden-phenomenon during the rolling procedure of for the elongated high-speed target in the larger space.
After They Closed the Gates brings to light the history of illegal Jewish immigration, a phenomenon hidden from view for decades.
Secondly, the decrease of tip diameter is hidden by another phenomenon: once the Sn is exhausted on the tip, the tip diameter will start to increase due to the coating by a-Si H.
But this nearly 6.5-mile-thick layer of water was apparently only a regional phenomenon, hidden beneath nearly 22 miles of ice.
