两个方法其做一可任意选择之故，即基于两者都是从一个外在的前提开始的。
The optionalness of either method is due to both alike starting from an external presupposition.
可任意选择不连续的三天或两天搭得过瘾！
Osaka, Kobe, Kyoto, Nara, Shiga, Wakayama, can freely choose three or two days in Happy day !
通过选择合适的匝数比，一次侧输入电压可任意转换成所希望的二次侧开路电压。
It has been shown that a primary input voltage can be transformed to any desired open-circuit secondary voltage by a suitable choice of turns ratio.
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