在没有其他信息的情况下，参数的最佳估计是其样本值。

In a rapidly changing market, flexibility and adaptability are the keys to business success.

The essence of strategy is in the activities – choosing to perform activities differently or to perform different activities than rivals.

A great novel is a world unto itself, with its own laws and logic.

林业的未来在于平衡经济增长与生态保护。