另一方面，全局变量是一种可在同一组件内的任一代码片段中使用的变量。
A global variable, on the other hand, is available to be used in any snippet within the same component.
(让参与者们观看能够引起快乐或悲伤情绪的电影片段，要求他们仔细回想自己生活中积极或消极的一方面)。
He did this by having them watch movie clips that either invoked happy or sad emotions, and asking them to dwell on positive or negative aspects of their own lives.
视频片段能够很好地展现出竞选者们截然不同的两面性。
Video clips are a good way of making candidates look two-faced.
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