It is no accident that men fill most of the top jobs in nursing,while women remain on the lower grades
问题描述：
It is no accident that men fill most of the top jobs in nursing,while women remain on the lower grades
答
在这里是说男人们在护理行业里做的都是高级工种。Fill,填充那些职位（nursing)
答
fill在这里解释为：担任（职务）