尽管栖息地容易遭到破坏，但大天鹅仍以18万只的种群数量冠居天鹅家族之首，而且其栖息范围也超出了其他种类的天鹅。
With a population of about 180,000, the whooper, though vulnerable to loss of habitat, is among the most abundant of swans and trumps others in the sweep of its range.
据估，中国拥有2.5亿网络用户，网民数量居世界之首。
China has the world's largest online population of any country with an estimated 250 million users.
单字母词语是字母词语中特殊的一类，在文学作品中出现数量和频度都高居于字母词之首位。
The single lettered word is a special one in lettered words and it presents the quantity and frequency to rank first high in the literary works.
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