Research has shown[ that when speaking, individuals (who have been blind from birth and have thus never seen anyone gesture )nonetheless make hand motions just as frequently and in the same way as sighted people do, ]and [that they will gesture even when conversing with another blind person.]
-- by 会员 bendrift (2010/6/19 20:44:35)
把第一个that后面看成整句话
when (individuals)speaking, individuals...make hand motions just as frequently and in the same way as sighted people do...
个人觉得,这个逗号用来分开when的时间状语从句和主句还满正常的
比起不用逗号更加清晰吧……
-- by 会员 小伊YSY (2010/6/20 0:15:34)