"harsh challenge" is correct and usable in written English.
It can be used to refer to something that is difficult or potentially dangerous. For example: "Climbing this mountain is going to be a harsh challenge, but I'm determined to reach the summit."
"Acer encountered many complicated and harsh challenges in the past few years.
"Although the Japanese economy will face harsh challenges for the time being, the situation is likely to bottom out by the end of the year," the economists said in a note.
While human rights advocates are looking forward to the Thursday meeting, as well as Mr. Carter's televised address on Tuesday night from the University of Havana, they do not expect any harsh challenges to Mr. Castro.
"Although the Japanese economy will face harsh challenges for the time being, the situation is likely to bottom out by the end of the year," economists at the Mizuho Research Institute in Tokyo said in a note after the economic numbers were released.
This 14-minute short is another unsparing look at his own harsh challenges, in the vein of his award-winning feature film "When I Walk," which chronicled his declining mobility following a diagnosis of an aggressive form of multiple sclerosis.
After receiving some rough treatment on the left flank from the Korean defense in the form of multiple harsh challenges, Neymar continued to lead Brazil's search for the go ahead goal by dropping deep into midfield and orchestrating attacks that flowed through both sides of the field.
Somalia may now be free of polio, but Somali children are facing a host of other harsh challenges, said Bellamy.
The full story is a life of enduring hardship, harsh challenges and an amazingly resilient people who live in an incredibly hostile environment devoid of most government services.
"These settlements are the harshest challenge to Israeli democracy," Etkes said.
