他们商定，孩子们与父方母方分别各住两个星期。
They had an arrangement that the children would spend two weeks with each parent.
我得出结论：当地母方公司方面难以作出让步。
Hsueh博士说：部分原因可能是因为母方和父方基因的冲突。
Dr Hsueh suggests that part of the answer may lie in a conflict between maternal and paternal genes.
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