问题描述：
求一段英译汉的翻译【谢绝机器翻译】
Once a choice is made, change is frequently
difficult or even impossible. Such inflexibility closes off options, with
students unable to sample courses in different academic areas. Early
specialization can prevent costly indecisiveness, but systems that are
unforgiving of early "mistakes" do not develop and unleash the true
potential of many students.
Once a choice is made, change is frequently
difficult or even impossible. Such inflexibility closes off options, with
students unable to sample courses in different academic areas. Early
specialization can prevent costly indecisiveness, but systems that are
unforgiving of early "mistakes" do not develop and unleash the true
potential of many students.
问题解答：
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