鱼和熊掌，两个都得要。
灰姑娘是个美丽的女孩。她有两个继母生的丑姊姊。这两个姊姊对灰姑娘很不好。所有的事都得要灰姑娘做。她必须煮饭、洗衣，什么事她都要做。ꛨ。
Cinderella is a beautiful girl. She has two ugly stepsisters. They are not kind to Cinderella. Cinderella does all of the work. She must cook, clean and do everything.
要知道什么样的URI是一个有效的URI，这两个部分都得要学。
To understand what is a valid URI, both the grammar and the associated description have to be studied.
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