"only entails" is a correct and usable phrase in written English.
It can be used to restrict the number of possibilities or outcomes. For example, "This kind of research only entails collecting data; no other form of investigation is necessary."
It only entails the modernisation of the state apparatus to live up to the economic and geopolitical challenges that await us.
While Mr Cook's agenda in Moscow last month included talks with opposition leaders, as is the protocol on such official visits, Mr Blair's itinerary only entails seeing Mr Putin.
The modification mechanism of GO to non-modified binder includes both chemical reactions and physical blending, whereas it only entails physical blending in the case of SBS modified binder.
That only entails, however, that not all the things in the story are true of him, not that he didn't exist.
Perhaps more people will come to realize that the minor spending-growth restraint entailed in the sequester not only entails no disaster, but is a positive development fully consistent with a steadily-rising stock market and more robust job gains.
The state of the world in 1900 only entails that Ted grabs a beer from the fridge by way of entailing the entire physical state of affairs at the later time.
It only entailed a short train journey to Tigre, and a 40-minute boat ride (about £8).
Road pavements design and construction solutions affect maintenance works during service life, which not only entail economical and financial expenditures but also damage service regularity for users.
Results show that CDEO is a promising technology for the degradation of progesterone, just the opposite of that observed for single sonolysis and photolysis technologies, which only entail a slight removal of progesterone and nil mineralization.
Most of your casual encounters may only entail small talk, but it's possible you'll learn that your newfound acquaintance is expanding her business and looking for someone with your skill set.
These differential coordinates, each set at once shifting and co-present with other sets, not only entail variable, plural viewpoints, but call up systems of value and meaning by which one evaluates a performance's worth, and embodies a stake in the terms of that worth.
