Step Five: Clasp your left thumb in your right hand and move thumb in circular motion - then switch thumbs.
第五步：右手握住左手大拇指，右手大拇指在左手手背上打圈，换手再做一次。
For instance, teachers have been known to force children to switch from using their left hand to using their right hand for writing.
比如，老师就曾强迫儿童们在书写中从使用左手转为使用右手。
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