System of postal-zone codes (zip stands for "zone improvement plan") introduced in the U. S. in 1963 to improve mail delivery and exploit electronic reading and sorting capabilities.

1963年美国为了便于邮件的分拣和投递而采用的邮政编号制。

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For many U. S. students and their families, college costs are a worry at this time of year with college admission letters arriving in the mail and aid application deadlines nearing.

对很多美国大学生和他们的家庭来说，每年的这个时候，当大学的准入信进入信箱而助学贷款截止日迫近的时候，大学的花费都会引起他们的担忧。

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For many U. S. students and their families, college costs are a worry at this time of year with college admission letters arriving in the mail and aid application deadlines nearing.

对很多美国大学生和他们的家庭来说，每年的这个时候，当大学的准入信进入信箱而助学贷款截止日迫近的时候，大学的花费都会引起他们的担忧。

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