在这项研究中，她和同事们根据抓到的虱卵数量估算虱子滋生的程度。他们认为，虱卵越多，说明产卵的虱子越多。
In this study, she and her colleagues estimated the degree of louse infestation by the number of nits picked. The more nits, they calculated, the more lice-producing nits.
可通过普查和调查来估算人口数量，但这无法提供死亡原因信息。
Censuses and surveys can be used to estimate population Numbers, but do not provide information on causes of death.
这些数字根据他们所拥有的股票数量和估算银行指定盈利的百分比作为股息分发。
These figures are based on the number of shares the executives own and estimates from the Banks about the percentage of earnings they plan to earmark for dividend payments.
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