Managers and employees the nature of the relationship is a self-evident psychological contract, and in constant evolution.
管理者与员工关系的本质是一种不言而喻的心理契约，并在不断演进。
As long as the forces of selection stay constant, natural selection canpush evolution in one direction and produce sophisticated structures insurprisingly short times.
只要选择的影响力存在，自然选择就能把进化向一个方向推进，在出乎意料的短时间内产生复杂的结构。
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