Sickling - This term is used for a fault in which the dancer turns his or her foot in from the ankle, thereby breaking the straight line of the leg.

• 从这个英文解释来看，要改正这个错误就很简单，其实腿和脚应该是一条直线，不能有打折的地方，用力把脚后跟往前推，脚指要竖起来，前腿的话大脚趾尽量去碰地板