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slow to change partly because the explanatory items often seem to be directly observed and partly because other kinds of explanations have been hard to find. 句子分析: 第一、句子可以拆分為三段: The behavioral sciences have been slow to change/partly because the explanatory items often seem to be directly observed and/partly because other kinds of explanations have been hard to find. 第二、句子的主干結(jié)構(gòu)是:主句 +兩個并列關(guān)系的原因狀語從句之所以 …… ,部分是因為 …… ,部分是因為 …… 第三、詞的處理: the explanatory items 用以解釋的要素 (內(nèi)容,項目 ) other kinds of explanations 其他解釋方式 完整的 譯文: 62)行為科學(xué)之所以發(fā)展緩慢,部分原因是用來解釋行為的依據(jù)似乎往往是直接觀察到的,部分原因是其他的解釋方式一直難以找到。 63) The role of natural selection in evolution was formulated only a little more than a hundred years ago, and the selective role of the environment in shaping and maintaini