The phrase "are undoubtedly required" is correct and usable in written English.
It can be used when emphasizing the necessity or importance of something in a statement or argument.
Example: "In order to ensure the safety of all participants, certain precautions are undoubtedly required."
Alternatives: "are certainly needed" or "are clearly necessary."
Big changes are undoubtedly required – and in train.
While such measures are undoubtedly required, the real precondition for the euro's long-term stability, if not survival, is a real political union of its member states.
Major studies are undoubtedly required to confirm this intriguing hypothesis.
In parallel, theoretical work on more sophisticated models of human demography and improved methods of data analyses are undoubtedly required.
More thorough studies are undoubtedly required to tease apart the contribution and possible interaction between different models and optimality criteria [ 4, 6, 60, 63, 66].
We conclude that experimental settings are undoubtedly required for effective communication training, and several studies have emphasized the advantages which RP or SP may carry for communication training.
Thousands of years were undoubtedly required for the development of simple mechanical devices and machines such as the wheel, the lever, and the pulley, by which the power of human muscle could be magnified.
Digital is undoubtedly required as there won't be an option soon, internet demand will grow, but investment in delivery via mobile phone and downloadable podcasts?
Second, AID is actively imported into the nuclear compartment, a step that is undoubtedly required for its essential role in antibody gene diversification [10], [11].
Further research is undoubtedly required, and the next stage is a feasibility study with carers from a range of settings.
Although these findings appear promising, a much larger pool of both potential targets and effective therapeutic strategies is undoubtedly required.
