Does anyone know the word' at your convenience' in Allegro?

It is said that there is a foreign girl named Mary Lu, who is a famous model in fashion show. She is tall and thin, with a slender neck, beautiful appearance and powerful movements. Every man was intoxicated by her performance and couldn't sleep when he got home (Zhuo Sheng). She opened her eyes and closed them again. It's been at least ten and a half years, and it's still 20% off. Not long ago, this Mary Lu came to China for a performance visit with a delegation. Applause the flowers to count her, everything went well, and there was one thing that puzzled her. In hotels, people often say, "I'm sorry, I'll wait for you." This is a convenience, but Mary Lou doesn't understand it. The translator quickly explained it in this English. In China, it is to go to the toilet. Mary Lou laughed. She laughed so hard that people in China would bring gifts. It's really hard to figure out whether it's convenient or not. Ah, the next day at the hotel on Mary Road, I received a phone call from a young man introducing myself. "Hello, are you Miss Mary Road? Yo! Great, I'm a fan of yours. I am the most loyal admirer. I want to take a picture with you at your convenience. Please don't shirk. " Mary Lou turned pale with fear. Well, back and forth. I never take pictures, and I have no guests when it's convenient. "