这个星期7月4日举行的庆祝活动标志美国主题乐园今年夏季活动拉开序幕。

This week's July 4th celebrations marked the beginning of the summer season for America's theme parks.

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这次活动标志着研究人员预计在历史性的18至24个月的科学研究的运行开始。

The event marks the beginning of what researchers expect to be a historic 18- to 24-month science run.

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世俗的庆祝活动标志是打扮然后嘉年华风格在服装以及玩“不给糖就捣蛋”活动以幽灵鬼魂等元素。

The secular celebration is marked by dressing up in costumes and trick-or-treating and carnival style events characterized by spooky elements such as ghosts.

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