题目内容
4. The research is so designed that nothing can be done to change it.(once) ,
这项研究被设定为:一旦开始,任何东西都无法改变它。
4. once it's begun/started
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题目内容
4. The research is so designed that nothing can be done to change it.(once) ,
这项研究被设定为:一旦开始,任何东西都无法改变它。
4. once it's begun/started