艰难赛道挑战

"A big obstacle to understanding the manual was that it had been poorly translated from the Japanese."

"His illness ran its course."

"My brother enjoys the racing at the local car show. "

"The difficult math problem was a real challenge for Sarah, but she found it enjoyable because of the intellectual struggle. "

"The children splashed in the muddy puddles after the rain. "

"The children were climbing the rope ladder at recess. "

"Clutching my wounded side, I crawled back to the trench."

"It requires great strength to lift heavy objects."

"Running a marathon requires a lot of physical endurance. "

"After a few slips, the tires gripped the pavement."

"Kangaroos are known for their ability to jump high."

"Maintaining a balance between work and family is challenging, but important for a healthy life. "