preventive detention 预防性监禁 

指审判前为防止刑事被告人逃跑或有其它违法行为而予以羁押; 也指为防止精神病人伤害自己或他人而加以禁闭看管。在英国，法院有权加长惯犯的刑期，以保护公众免受罪犯侵害。预防性监禁,是指以特殊预防和防卫社会为目的,针对恐怖主义、极端主义、严重暴力犯罪、性犯罪等高风险已然犯罪人,基于对其人身危险性和再犯可能性的评估,为防止他们再次实施高风险犯罪而在刑罚执行阶段或刑罚执行完毕以后对其采取继续监禁的措施。

Legal Definition of preventive detention: detention of a defendant awaiting trial for the purpose of preventing further misconduct or protecting an individual or the public. Preventive detention is an imprisonment that is putatively justified for non-punitive purposes, most often to prevent (further) criminal acts. There is no universally agreed definition of preventive detention, and multiple types of detention are sometimes considered a form of preventive detention. 相关例句如下：

例句1

Usually, preventive detention is the detention of a convicted criminal who has served their sentence, but is considered too dangerous to release. In that case, the detention is considered "preventive" in that it is not intended to punish or deter the criminal, but to prevent the criminal from committing further crimes and/or also protect the public.

通常，预防性监禁是对已服刑但被认为太危险而不能释放的罪犯的拘留。在这种情况下，监禁被认为是“预防性的”，因为其目的不是惩罚或威慑罪犯，而是防止罪犯进一步犯罪和/或保护公众。

例句2

Preventive detention is a relatively recent phenomenon. Before the 1970s the general practice in criminal courts was to set bail for almost all criminal defendants. For defendants accused of particularly heinous crimes, courts would set the amount of bail so high that the defendants were unlikely to be released. Defendants in murder cases were held in jail without bail through the end of trial.

预防性监禁是一个相对较新的现象。20世纪70年代以前，刑事法庭的一般做法是为几乎所有刑事被告设定保释金。对于被控犯有特别严重罪行的被告，法院会将保释金定得很高，以至于被告不太可能被释放。谋杀案的被告在审判结束前被关押在监狱里，不得保释。

例句3

Preventive detention involves the detainment (confinement) of a person in order to keep them from committing future crimes and/or from escaping future prosecution. This can apply to: The holding (detaining) of wartime individuals. Holding to prevent escape.

预防性监禁涉及对一个人的拘留（监禁）,以防止他们将来犯罪和/或逃避将来的起诉。这可以适用于：关押（拘留）战时个人。抓住以防逃跑。

例句4

Preventive detention is a special form of imprisonment. Most persons held in preventive detention are criminal defendants, but state and federal laws also authorize the preventive detention of persons who have not been accused of crimes, such as certain mentally ill persons.

预防性监禁是一种特殊的监禁形式。大多数被预防性监禁的人是刑事被告，但州和联邦法律也授权对没有被指控犯罪的人进行预防性监禁，如某些精神病患者。