The technical problems of regulating balance are very common in physical experiment. The rule of dividing half and half is to quickly master the skills of regulating balance.

物理实验中常遇平衡调节的技术问题，对半法则是快捷地掌握平衡调节技巧的切实可行的方法。

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But because finding the right mix of charges is so crucial to a successful two-sided business, regulating prices could upset a delicate balance.

ECONOMIST: Economics focus