问题描述：
托福TPO12一篇阅读里的一个句子读不懂、、、、、
托福TPO12一篇阅读里《which hand did they use》里的一句话：
Even though the paint was often sprayed on by mouth,one can assume that the dominant hand assisted in the operation.One also has to make the assumption that hands were stenciled palm downward---a left hand stenciled palm upward might of course look as if it were a right hand.
尤其是第二句One also has to make the assumption that 后面扩折号前后关系,看不懂.求翻译.
托福TPO12一篇阅读里《which hand did they use》里的一句话：
Even though the paint was often sprayed on by mouth,one can assume that the dominant hand assisted in the operation.One also has to make the assumption that hands were stenciled palm downward---a left hand stenciled palm upward might of course look as if it were a right hand.
尤其是第二句One also has to make the assumption that 后面扩折号前后关系,看不懂.求翻译.
问题解答：
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