问题描述：
英语翻译
the statement said that investigators were in the process of changing the charge phase by all 30 Greenpeace activists from piracy to hooliganism.声明称调查者正在改变对30名绿色和平活动人士的指控,从海盗罪改为流氓罪.
这里的by 是什么用法?为什么要用介词by 而不是其他的 如 to towards
the statement said that investigators were in the process of changing the charge phase by all 30 Greenpeace activists from piracy to hooliganism.声明称调查者正在改变对30名绿色和平活动人士的指控,从海盗罪改为流氓罪.
这里的by 是什么用法?为什么要用介词by 而不是其他的 如 to towards
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