如果您曾编写过一些重要软件，您可能涉及过未知之未知问题—软件设计中最大的一个问题。
If you have written any nontrivial software, you can relate to the unknown unknowns problem - one of the biggest problems in software design.
最大的问题是养老金，与之相比最近在银行救济上的花费相形见拙。
One of the biggest problems is pensions, which will dwarf the cost of the recent bank bail-out.
农业地区最大的麻烦是老龄化问题。据农业省统计，日本三百万耕种者中百分之七十年龄在六十岁以上。
Aging is seen as the biggest problem in rural areas, where, according to the Agriculture Ministry, 70 percent of Japan's three million farmers are 60 or older.
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