the property of being an amount by which something is less than expected or required
问题描述：
the property of being an amount by which something is less than expected or required
答
the property of being an amount后面断句， by which（amount） something is less than expected or required
后面半句修饰amount，整个句子解释property
答
这个句子是介词短语作定语,介词短语中跟了一个从句,of being an amount 是介词短语充当property的后置定语,然后by which引导的定语从句修饰介词短语中的amount.
整个句子的语法大致就是这样了.