Even hidden in it is burrow，the gobygives off【2】 telltale clues【3】 and there is nothing it can do it .

　　The goby blowsit is cover 【4】just by breathing.

　　As water passes over it is gills,oxygen is extracted and absorbed.【5】

　　It canpick up【6】 on the goby’s they charges from a distance of 20 cms.

　　Underwater story: the chase of hammerhead shark and goby

　　A hammerhead shark,a predator in search of prey.

　　And in these wide waters,it is not easy.

　　Visibility is poor and prey are clever，their lives depend on it.

　　Out of sight is not enough.

　　Every breath produces a minute electrical filed which pulses around the fish’s head.

　　This bubble of electrical reaches 20 cms upwords.

　　An invisible signpost marking buried treasure. Of course ，not everyone can read this sign.

　　It needs a special kind of extra-sensory perception.

　　The underside of the head is lined with thousands of electrical detectors.

　　These are connected to long dots that allow the brain to register even minute electrical fields.

　　Knowledge points:

　　[1] give them away to escape

　　[2] give off exposure

　　[3.4] Telltale Clues = Blowscover leak trace

　　[5] Oxygen is extracted and absorbed oxygen exchange

　　[6] Pickup capture

　　# English thinking #