Platinum is a key material in the automotive industry. In this study, we first quantitatively analyzed the platinum cycle from 2009 to 2019 in the automotive industry in China. The stocks of platinum to 2050 were then evaluated under different scenario in the automotive industry. The total amount of platinum entered into the automotive industry was 145.77 t from 2009 to 2019. Among them, the in-use stocks of platinum in vehicles increased from 37.07 t to 133.78 t. Platinum stocks in the automotive industry under 2°C scenario for high-, baseline-and lowdemand in 2050 are 712.97 t, 529.32 t, and 345.67 t, respectively, while under carbon-neutral scenario, it is 440.55 t, 327.42 t and 214.30 t, respectively. Under the carbon-neutral scenario, the platinum stocks in gasoline and diesel vehicles in 2035 and 2050 will decrease, which can provide 61.41% and 49.92% of the platinum stocks for fuel cell and hybrid vehicles in 2035 and 2050, respectively.

Director Liao Xianghong"s national opera Canal Ballads has aroused the touching and affection of many domestic music researchers, singers and performers since the debut of National Grand Theater in 2012. The drama is based on the Beijing-Hangzhou Grand Canal which is comparable to the Great Wall. It depicts the Chinese story of the joys and sorrows of the two sides of the canal during Wanli of Ming Dynasty. In addition to the successful singers such as Lei Jia, Wang Hongwei, Wang Zhe and Wang Zenan who have successfully performed Yin Qing's vocal music works, the drama is also astonishing because of its strong creative team and its nationalized, localized and just opera conception, guiding the correct contemporary aesthetic direction and values of life. By collecting and studying the researches of others in recent years, this dissertation makes a more comprehensive assessment of the play and hopes to make theoretical explanations for furthering "Chinese story" and spreading "China"s good voice". Since its debut in June 2012, Chinese opera Canal Ballads has aroused widespread concern of many critics, researchers and music lovers. So far, a great deal of research achievements has appeared. The author enters the key word "canal ballad" in the periodical network. There are 42 articles directly related to it, including 15 master's theses, accounting for 36% of the existing achievements. This shows that the opera Canal Ballads has had widespread influence in recent years. At the same time, it highlights the opera"s rich musical features and dramatic conception, which provides vast space for researchers. In this article, the author chooses several representative ones to sort out greatness, and to carry on the author"s interpretation and thinking to strive to stand on the predecessors and continue to do some bedding of the future study of Canal Ballads. According to combing and analysis, in recent years, the relevant scholars" research on Canal Ballads focuses on the following aspects: Post-watch Comments The post-reviewing essay is also one of the earliest forms of study and the most important part of the opera Canal Ballads. Such article is the sense of concept. These commentators are good at using a variety of narrative techniques, such as analogy, lyric, etc., and insert some wonderful stills, so this kind of articles gives the audience a refined, illustrated, easy-to-understand and readable taste. Among them, there are some typical examples