（六）放射性同位素，是指化学元素中具有相同原子序数，但质量不同且能发生放射性衰变的核素。
김현중, ‘꽃보다 남자’ 당시 인기? “100억 이상 벌었을 수도”
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According to the latest best estimates by researchers from University College London, about 1.6 million UK adults have used weight-loss injections in the past year – mostly bought through private prescriptions rather than on the NHS.
一辆辆车来，一辆辆车走。车上拉的都是灯。
拓深度，以深厚文化提升“附加值”。到广州行花街、在天津听相声、去重庆吃火锅……感受中华文化和市井生活，正成为境外游客“中国游”的新趋势。进一步挖掘中华优秀传统文化资源，推动非遗、演艺等与旅游产业深度融合，有助于推动旅游形态由单一观光向深度体验转变，进而拓展境外游客在华消费的广度与深度。