As you probably know, postal codes vary widely throughout the world.
您可能知道，在世界的不同地方，邮政编码千差万别。
Dress codes vary by school district and are often applied at the discretion of teachers and school administrators.
每个学区的着装守则都不相同，具体实施往往凭老师或学校管理员的主观裁定。
Dress codes vary by school district and are often applied at the discretion of teachers and school administrators.
每个学区的着装守则都不相同，具体实施往往凭老师或学校管理员的主观裁定。
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