大学英语： A decision is a choice made from among alternative courses of action that are available.

　　译：决策就是从几种可以选择的做法中作出选择。

　　分析：该句是主系表结构。made from among alternative courses of action that are available是过去分词短语做定语修饰a choice; 其中that are available是定语从句修饰courses of action.

　　像这样一环修饰一环的句子结构在英文中很普遍，因此为了看懂句子大家必须学会分析。这是整个英语学习过程中很重要的能力!

　　2. The reason for making a decision is that a problem exists, goals or objectives are wrong, or something is standing in the way of accomplishing them. (p1)

　　译：做出决策的原因是因为存在问题，目标或目的有错误，或者有某种东西防碍着它们的实现。

　　分析：该句又是主系表结构。That引导三个并列的表语从句，①a problem exists，②goals or objectives are wrong;③something is standing in the way of accomplishing them。 短语：make a decision:做出决策;stand in the way: 阻挡、防碍

　　3. Often managers must make a best guess at what the future will be and try to leave as little as possible to chance, but since uncertainty is always there, risk accompanies decisions. (p2)

　　译：通常管理者必须对未来的情况做出最佳预测，从而使偶然性尽可能少地发生，但因为不确定性总是存在，所以决策常伴随着风险。

　　分析：前半句是主谓宾结构。what the future will be是at的宾语;as little as possible做leave的宾语;since引导原因状语从句，相当于because.