增值税法第三条所称无形资产，是指不具实物形态，但能带来经济利益的资产，包括技术、商标、著作权、商誉、自然资源使用权和其他无形资产。
Galaxy Buds 4 and Buds 4 ProSam Rutherford for Engadget
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這起事件發生前一週，美國也曾出現類似威脅，導致華盛頓特區肯尼迪（甘迺迪）表演藝術中心被疏散。美國媒體報導指出，該威脅同樣針對在當地演出的神韻藝術團。
It is difficult to know exactly when the shift from gelatine to agar occurred. As often happens for scientific breakthroughs, agar was likely adopted incrementally alongside the use of other growth media. In 1913, for example, the first diagnosis of Serratia marcescens as a human pathogen was made by growing it on agar as well as on potatoes.