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以实例讨论了自助法的原理和方法，表明用该法在指导生产和科学试验方面可以节省时间和降低费用，是一个有推广价值的好方法。
An example is given to discuss the principle and method of self-help law, which shows that this method can save time and reduce costs in guiding production and scientific experiments. It is a good way to promote the value.