keep sb./sth. out of sth.简单

Restrictions that keep highly polluting cars out of certain areas — city centres, “school streets”, even individual roads — are a response to the absence of a larger effort to properly enforce existing regulations and require auto companies to bring their vehicles into compliance.

禁止高污染汽车进入某些区域——市中心、“学校街道”，甚至个别道路——的限制措施，是对缺乏更大力度的努力的一种回应，这种努力指的是切实执行现有法规并要求汽车公司使其车辆达标。

Ants keep predatory insects away from where their aphids feed; Gmail keeps the spammers out of our inboxes.

蚂蚁让捕食性昆虫远离蚜虫进食的地方；Gmail则把垃圾邮件发送者挡在我们的收件箱之外。

There is pressure for change from within the profession, but opponents of change among the regulators insist that keeping outsiders out of a law firm isolates lawyers from the pressure to make money rather than serve clients ethically.

行业内部存在要求变革的压力，但监管者中反对变革的人坚持认为，将外人挡在律所之外，能使律师免受只顾赚钱、而不合乎职业道德地为客户服务的压力。