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关于两个从句的介词使用问题

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关于两个从句的介词使用问题
Ekman and his colleagues more recently obtained similar results in a study of ten cultures in(为什么有这个介词?) which participants were permitted to report that multiple emotions were shown by facial expressions.
Whether the goverment should increase the finance of pure science at the expense of technology or vice versa often depends on the issue of(这个介词的作用?) which is seen as the driving force.
1第一句的意思为Ekman和他的同事最近在一个十种文化的研究中发现相似的结果,即研究的参与者能够通过脸部表情表现复杂的情绪.which在此表示这个研究,所以这里的介词in用来表示participants in the study
2which指代issue,个人认为这里的of是不需要的,本来应该是of which the...