That is why all this research is so important.Projects are underway to study many of the conditions that affect our Shelties today.
这就说
了为什么这些研究和探索是很重要
。
复数）That is why all this research is so important.Projects are underway to study many of the conditions that affect our Shelties today.
这就说了为什么这些研究和探索是很重要。
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