美语听力练习素材:芝加哥河水变绿庆祝圣帕特里克节

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1.The dye was spread in the river from the back of a boat ahead of a St. Patrick's Day parade downtown.

ahead of在…之前

He is ahead of the age.
他站在时代的前列。

2.There was no immediate claim of responsibility, though Islamic State group militants have carried out similar attacks before.

carry out执行；进行；完成

The Navy is to carry out an examination of the wreck tomorrow.
海军明天将对失事船只进行细查。