put some stones at the bottom of the tank改为否定put some stones at the bottom of the tank改为否定句

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putsomestonesatthebottomofthetank改为否定putsomestonesatthebottomofthetank改为否定句putsomestonesatthebottomo

put some stones at the bottom of the tank改为否定put some stones at the bottom of the tank改为否定句
put some stones at the bottom of the tank改为否定
put some stones at the bottom of the tank改为否定句

put some stones at the bottom of the tank改为否定put some stones at the bottom of the tank改为否定句
否定句：
Don't put any stones at the bottom of the tank.