In winding itself round the wires,这儿为什么用in?In winding itself round the wires,the snake had sent sparks down to the ground and this caused the fire.这句话前面为什么用in?

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In winding itself round the wires,这儿为什么用in?
In winding itself round the wires,the snake had sent sparks down to the ground and this caused the fire.这句话前面为什么用in?

in winding是词组,你不用in用什么