"We've been thinking about this for several years now - we've had a look at a number of different approaches, and didn't have any success," one of the research team, Derek Tittensor, told BBC News.
“对这个问题，我们已经思考了几年——我们看到了各种各样的估计值，却没有取得任何成果。”研究团队的一员，DerekTittensor对BBC News说。
"We've been thinking about this for several years now - we've had a look at a number of different approaches, and didn't have any success," one of the research team, Derek Tittensor, told BBC News.
“对这个问题，我们已经思考了几年——我们看到了各种各样的估计值，却没有取得任何成果。”研究团队的一员，DerekTittensor对BBC News说。
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