The phrase "are two common ones" is correct and usable in written English.
It can be used when referring to two examples or items that are frequently encountered or recognized in a particular context.
Example: "When discussing programming languages, Python and Java are two common ones that come to mind."
Alternatives: "are two frequent examples" or "are two typical instances".
Gradient boosting and AdaBoost are two common ones of them.
Here are two common ones, courtesy of Tom West, a small-business valuation expert and author of The Business Reference Guide: –A multiple of two to three times pretax income, plus inventory.
"I must never give up" and "It's my job to make sure people are happy" are two common ones.
And, there are times when altering physical features clearly improve one's lifestyle -- breast reduction and deviated septum correction are two common ones.
Here are six common ones.
> There are two common DAs in CDART, one with and one without the second ABC_ATPase SF domain (Table 2, 2554 vs. 1542 NR sequences, respectively, determined 4 November 2014).
There are two common right answers for one of them and a rare one for another.
There are two common ways to provide insight: one is to focus on specific use cases, and the other is to focus on particular patient populations.
If you have any questions or doubts regarding how and when to administer the injection, consult your physician or other medical professional before continuing.There are two common types of injections that one can regularly perform at home legally: subcutaneous and intramuscular.
There are two common types of borehole fracture: first one is drilling induced tension fracture (DITF) and the second one, with 90° of difference, is called breakout.
There are two common peaks in ZnO Raman spectra: one at 437 cm-1 corresponding to E2H mode and one broad peak at 580 cm-1, which is a combination of E1LO and A1LO modes and usually been found to be enhanced by disorder [17].
