It's been challenging to make these batteries practical.
It could be challenging to make the deal work under salary-cap rules, however.
Ms. Bettany said it had been challenging to make iCloud work properly inside the app.
It's a bit challenging to make it cool and breathable and yet block out the sun.
This isn't that novel a proposition, but it is challenging to make it all work.
"It's challenging to make a correct diagnosis of cancer," he says.
"For instance, I find it super challenging to make it sexual, more fun, more graphic and playful," he said.
The issues raised are very personal and salient, O'Neil said, and many students find it challenging to make themselves vulnerable.
Mr. Ng was immediately interested, though he said he knew it would be challenging to make the lamps both attractive and structurally sound.
While it might be challenging to make one particular flu virus, like mutH5N1, it is not hard to try to breed new flu viruses.
"The difference is enormous, as you can see," she says, though I find it challenging to make head or tail of these little things.
