...件上都争论不休，存在“必要原因说（necessary cause）”、“最终原因说（ultimate cause）”、“有效原因说（efficient cause）”、“直接原因说（direct cause）”等，如此众多的理论观点，对于原因与条件的判断并无一个客观、统一的标准，学说之间大相径庭...
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有人说谈判纯粹是一门艺术，其实不尽然。事实上，有效谈判是一门科学或一套程序，应有系统地进行，原因如下。
Negotiating effectively isn't really an art. Instead, it is a science or a process that can and should be systemized because.
但他警告说，并未有证据显示该药比行为干预疗法更有效，而且导致自闭症的大多数原因仍然神秘莫测。
But she cautions that the drugs have not yet been shown to work better than behavioural interventions and that most causes of autism are still deeply mysterious.
农民正在尝试生产转基因家畜，但不是很有效，原因是像上面说的那样，遗传性改变胚胎的能力极小。
Farmers are attempting to produce transgenic livestock already but not efficiently due to the minimal ability to alter embryos genetically as stated above.
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