with意思倾向于并列.例如是朋友间（同级的）的陪同. 而by的意思倾向于被动. 例如children under 14 must be accompanied by adult.长辈对晚辈的陪同. The candidate was accompanied by six burly bodyguards.对主人的陪同. your application form should be accompanied by you CV.申请表格应该附带简历. be -nied with (a thing) 带着,带有,兼有 (be)-nied by 附有,伴随 但如果真的用起来,其实没有很大区别.
