Even though we have a good list from a teacher knows us well, we may encounter times when we can't get through with one of the book in the list.
即使是一位熟悉的师长很有针对性地为我们开了一份必读书目，书目里的名著也有读不下去的时候。
Often we encounter equations which can be solved by methods applicable to quadratic equations, even though these equations are not actually quadratic.
我们经常会碰到一些方程序，它们可以用适合于二次方程序的方法来解，即使这些方程序实际上并不是二次的夜没关系。
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