"There have been" 是一个句型,它属于 "There be" 句型的现在完成时态形式。 现在完成时是过去的动作或状态持续到现在并且已经完成,对现在造成的影响,可能持续发生下去。he's 可以是he has的缩写,也可以是he is的缩写,he has+动词的过去分词,构成现在完成时形式,he is...
India is an interesting case study. India has been in a transition period, shifting from a position of considerable subordination to the United States and the West on vario...
CCTV: Recently there has been intensive coverage in international media on President Xi Jinping's important remarks at the 28th APEC Economic Leaders' Meeting and the APEC ...
while the coronavirus is still out there, a "political virus" is also spreading in the US and jumping at any opportunity to attack and slander China. Some politicians ignor...
and the good news is that there has been progress made in federated learning, also known as distributed learning. In this framework, patients’ data is stored and never lea...
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