The first observation is we cannot use our usual method of looking for critical points of f.
好，在这种情况下我们首先发现,之前用来找极值的方法都不可用。
Area F had a peeling milky fence around it. Outside the fence hawkers had dripping bags of sachet water for sale; a few sold dead-looking loaves of bread and fried buns.
F区周围有一圈漆已经开始剥落的乳白色栅栏，栅栏的外面沿街小贩叫卖着滴水的袋装洗发水，有些还卖着色泽黯淡的面包和煎过的圆面包。
When F. Scott Fitzgerald was looking at colleges he found Harvard sort of indoors. He found Yale brisk and energetic like a day in October.
斯科特先生考察了所有大学以后发现，哈佛是一种倾向于学问型的，而耶鲁则生气勃勃，精力充沛，如同十月天。
When F. Scott Fitzgerald was looking at colleges he found Harvard sort of indoors. He found Yale brisk and energetic like a day in October.
斯科特先生考察了所有大学以后发现，哈佛是一种倾向于学问型的，而耶鲁则生气勃勃，精力充沛，如同十月天。
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