become adapted to humans, and eventually spread among humans. However, it remains unclear which animals were the intermediate hosts and how it spilled over to humans.“
注:"ought to",应当,应该; 理应。 11) however, it is important to point out that … 然而,指出…是很重要的。 12) from this it follows that … 从这一点接踵而至的是… 注:"it fol...
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