学习本教程不需要 DB2 9 的副本。 但是，可以从 DB2 Express-C Web 站点 下载 DB2 Express-C 的一个免费副本，以便进行技能练习。

You do not need a copy of DB2 9 to complete this tutorial; however, you can download a free copy of DB2 Express-C from the DB2 Express-C Web site to practice your skills.

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只有通过练习、耐心和坚持不懈才能获得技能。

Skill comes only with practice, patience, and persistence.

《柯林斯英汉双解大词典》

换句话说，他们的玩耍是为了练习生存技能，比如狩猎和战斗中运用的动作。

In other words, they play in order to practice survival skills, like movements used in hunting and fighting.

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