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许多稍稍难一点的题目,往往令学生束手无策,找不到结论与条件的结合点,找不到门路.而要找开这门的钥匙,其中一个便是构造法.
Many of the more difficult topics often make students helpless, unable to find a combination of conclusions and conditions, can not find the door. And to find the key to open this door, one of which is the construction method.