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Please Fasten Your Seatbelts Severe turbulence (湍流) can kill aircraft passengers. Now, in test flig...

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takes off    is taking off    has taken off    took off  
takes off    is taking off    has taken off    took off  
attach; to    fasten; to    tie; to    stick; by  
the lidar detector needs improvement.  many airlines are interested in the system.  passengers often forget to fasten their seatbelts.  the lidar detector can be used in a wide range of areas.  
on the board    on board    on a board    on boards  
on board; until  abroad; since  on the board; before  aboard; when  
takes off    is taking off    has taken off    took off  
takes off    took off    has taken off    is taking off  
make out  make for  make up  make sure  
takes off    is taking off    has taken off    took off  
takes off  is taking off  has taken off  took off  
takes off    is taking off    has taken off    took off  
takes off   is taking off   has taken off   took off  
takes off   is taking off   has taken off   took off  
on board; before    abroad; since    on the board; after    aboard; when  
takes off    is taking off    has taken off    took off  
make out  make for  make up  make sure  
broad  abroad  aboard  board  
takes off    is taking off    has taken off    took off  

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