定义

• "At night, to survive becomes a real challenge."
• "Instead, you're going to be taking part in some exciting, challenging, and extremely dangerous missions..."
• "Joan Wayne attempted to scare the shark by firing at its dorsal fin, then challenged the shark to a duel, running into the water with pistols drawn."
• "Bruno : Instead, you're going to be taking part in some exciting, challenging, and extremely dangerous missions..."
• "The work is sometimes challenging but it'll be an excellent opportunity for a young man like you to prove himself."
• "Well, the ultimate salesperson needed the ultimate challenge."
• "Now, if there are no further questions, I'll simply say that I look forward to my new role as the spokesbaby for the Delavigne Corporation, and the many challenges that lie ahead of me."
• "Set challenging targets!"
• "I have ten years' experience in the customer service field, as well as management experience in a local telemarketing firm. The challenging environments in which I've worked have taught me to think on my feet, communicate clearly and always remain polite and professional while dealing with callers."