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英语翻译The value shown at +dV/dt indicates as a percentage of 5

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英语翻译
The value shown at +dV/dt indicates as a percentage of 500V,the size of voltage variations within 300m/sec.permitted before +dV/dt is only active as long as it is exceeded.
上述原文有语病:
The value shown at +dV/dt indicates as a percentage of 500V, the size of voltage variations within 300m/sec permitted before +dV/dt is only active as long as it is exceeded.
怎么能够有indicates和第一个is共同存在在一个句子里,究竟哪一个是主词,是The value shown at +dV/dt,还是the size of voltage variations within 300m/sec permitted before +dV/dt?
如果把句子断开,可有两种可能.
1. The value shown at +dV/dt indicates as a percentage of 500V, the size of voltage variations within 300m/sec. The value permitted before +dV/dt is only active as long as it is exceeded.
在+dV/dt所显示的值就等同与500伏的一个百分比,此百分比是发生在时速每秒300米每秒以内的电压变化幅度.只要该值超出额定范围(即+dV/dt )的时候,该值就起作用(归纳为活性值).
2.
The value shown at +dV/dt indicated as a percentage of 500V, being the size of voltage variations within 300m/sec permitted before +dV/dt, is only active as long as it is exceeded.
显示为500伏的一个百分比的+dV/dt值,即在+dV/dt所允许情况下的时速每秒300米内,若超出额定范围(即+dV/dt )便会起作用(或归纳为活性值).
The value shown at +dV/dt indicates as a percentage of 500V,the size of voltage variations within 300m/sec.permitted before +dV/dt is only active as long as it is exceeded.