如果雌狒狒在一年内维持不变的梳理毛发的伙伴，它们的寿命会更长，存活下来的后代也更多。
Females who were able to maintain the same grooming partners from one year to the next lived longer and had more surviving offspring.
事实却也不尽然，研究人员发现，在第二年就更换了伙伴的雌狒狒中，有百分之八十们它们先前的伙伴仍在族群之内。
The researchers found that 80 percent of females that switched close grooming partners from one year to the next did so despite that fact that their earlier companion was still in the group.
事实却也不尽然，研究人员发现，在第二年就更换了伙伴的雌狒狒中，有百分之八十们它们先前的伙伴仍在族群之内。
The researchers found that 80 percent of females that switched close grooming partners from one year to the next did so despite that fact that their earlier companion was still in the group.
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