This is a grammatically correct part of a sentence.
You can use it whenever you want to emphasize that something has been left to further progress. For example, "The ground-breaking work done by scientists in this field has been left further to be explored."
Calculation of the internal consistency of Communication openness showed that the item reduced the factor's reliability and, therefore, the item has been left out of further analyses and deleted from the questionnaire.
Nevertheless, QoE classes proposed in [23] are just experimental (i.e., non-standardized) and it has been left for future work further testing using network traces from real mobile networks.
The stickiness of its wet cap distinguishes the species from others classified in Xerocomus, and hence it has been left in Boletus pending further research.
Council engineers inspected the damage on Monday with the owners of houses further down the slope worried because further rubble has been left overhanging the spot.
In retrospect, the creation of polytechnics, most of which morphed into universities, may be seen to have been a mistake to the extent that further education has been left behind.
The ground has been left very wet from Saturday night's rain and this increases the risk of further flooding".
Defenders of structural funds argue that poor regions would have been left even further behind, were it not for all that lovely Brussels loot.
After Tiger Woods declared he would not participate in the Masters following back surgery, those in charge of the year's first major would have been left with further worries had Mickelson, a three-times winner, also exited the field.
Any quantitative verifications by using experiments have been left to further research.
We believe that much more work have been left for the further research after our computational estimation.
