慢速英语:Sea Levels and Arctic Temperatures Rise

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短语讲解：

1. That is because snow and ice melt, or break off from glaciers.

break off （使） 分离; （使） 脱离
例句：Don' t break off the branch.
勿折树枝。

2. The best estimates show that temperatures around the Earth have risen more than a half-degree Celsius since 1880.

more than 超过; 不只是; 很; 在…次以上
例句：Margaret needed support more than ever.
玛格丽特比以往更需要关心。

3. Scientists say that most of that rise is because of emissions, or gases, released into the air by machines that humans have built.

because of 因为
例句：John's jacket got out of shape because of the heavy rain.
约翰的夹克因为大雨而变形。