So what we've been doing a couple of years -- but last year was a big year -- is we started tagging sharks so we could try to get some idea of sight fidelity and movements and things like that.
因此这也是我们这几年一直专注的事业。但是去年却非比寻常 因为我们开始给它们编号做标记 这样我们就可以进一步获得信息 例如它们视力精确性和游动范围等信息