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To date,scientists have not yet detected this form of life...(paragraph 5)What does"this form of lif...

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F= Xi Ye+ XeYi  F=XeYi-Xi Ye  F= XiYi +XeYe  F= Ye- Y i  
YE  CYE  CXZHYE  YECX  
YG  YT  YE  YN  
Hello!  Hello! GoodMoring!  Hello! Good moming! Bye_ye!  Hello! Bye_ye!  
cosy+2yex+2xln2,xsiny-ex  cosy-2yex-2xln2,xsiny+2ex  cosy-2yex+2xln2,-xsiny-2ex  siny-2yex+2xln2,cosy-2ex  
斜线终点坐标(Xe,Ye),当︱Ye︱>︱Xe︱时,计数方向取GY  斜线终点坐标(Xe,Ye),当︱Xe︱>︱Ye︱时,计数方向取GY  圆弧终点坐标(Xe,Ye),当︱Xe︱>︱Ye︱时,计数方向取GY  圆弧终点坐标(Xe,Ye),当︱Xe︱<︱Ye︱时,计数方向取GY  
cosy+2yex+2xln2,xsiny-ex  cosy-2yex-2xln2,xsiny+2ex  cosy-2yex+2xln2,xsiny-2ex  siny-2yex+2xln2,xcosy-2ex  
cosy+2yex+2xln2,xsiny-ex  cosy-2yex-2xln2,xsiny+2ex  cosy-2yex+2xln2,-xsiny-2ex  siny-2yex+2xln2,cosy-2ex  
must have prepared    couldn’t have prepared    must prepare    could prepare  

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