慢速英语:Trump Withdraws US from Paris Climate Deal

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短语讲解：

1.Carbon dioxide comes from burning fossil fuels.

come from 源自; 来自某处; 出生于; 由…造成
例句：He's just come from the countryside.
他刚从乡下来。

2.U.S. allies around the world have expressed concern about what will happen if America pulls out of the agreement.

concern about 使（自己）关心…
例句：The group has expressed concern about reports of political violence in Africa
该团体对有关非洲政治暴力的报道表示关切。
pull out of 退出，取消;
例句：Sterling has been hit by the economy's failure to pull out of recession
经济未能走出衰退，英镑因此受到了打击。