... 杀鼠剂的选择性、selectivity of rodenticide 时差选择性、time difference selectivity 位差选择性、location difference selectivity ...
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We cannot say how much of the difference is the result of selectivity of migrants at the time of move and how much results from lowered fertility after moving to the urban setting.
我们无法说这个差距在多大程度上取决于移民时的选择，多大程度上取决于移民城市后生育力的下降。
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