全球平均气温的汇总数据共有三种，每一种都是基于成千上万个温度计的读数来计算的，这些温度计分布在各个气候站中和轮船的夹板上，它们的读数可以追溯到150年前的气温。

There are three compilations of mean global temperatures, each one based on readings from thousands of thermometers, kept in weather stations and aboard ships, going back over 150 years.

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也， 最大多数的激光唱碟和当磁盘片不能够被读的时候数字化视频光盘驱动器被设计戴面具或跳越数据， 一些将会尝试到再读数据， 但是最后地将会跳越或戴面具如果后来的阅读不及格。

Also, most CD and DVD players are designed to mask or skip data when the disk cannot be read, some will attempt to re-read the data, but ultimately will skip or mask if subsequent reads fail.

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