Required reading for teenagers who want the knowledge - however challenging.
However, challenging issues still exist in this field.
The implementation of this strategy is, however, challenging.
These experiences inform my values and moral leadership, ensuring that we do what's right, however challenging.
Measurement of autoantibodies remains, however, challenging because of the deficiency of reproducible, sensitive, and standardized assays.
It will also mean changing what is done with aid when the results emerge, however challenging this may be.
The integration of the ecosystem services concept into decision making remains however challenging.
However, challenging clonal variability, limited vector repertoire and insufficient genome annotation have hampered further developments.
Mr. Ligeti now has serious street cred, perhaps because there is something about his music, however challenging it may be, that listeners do seem to understand.
On the other hand, stasis, repetition, sheer duration have their own meaning in fiction, however challenging they may be to the reader.
This is however challenging as current controller designs for battery charging have no mechanisms to incorporate such information.
