intervene的名词是：intervenor。
intervenor： n. 介入者；干涉者
英文释义：a party who interposes in a pending proceeding.
例句：
1、Second part: this part closely examines the relevant problems of the system of intervenor with no independent right to claims.
第二部分：审视无独立请求权第三人制度的相关问题。
2、Finally, it brings up some relevant advices on the legislation of the system of intervenor with no independent right to claims in our country.
最后提出了对我国无独立请求权第三人制度相关立法的建议。
intervene：
v. 干预；介入；出面；插嘴；打断（别人的话）；阻碍；阻挠；干扰；介于......之间
英文释义：
1、出面；介入
to become involved in a situation in order to improve or help it.
2、插嘴；打断（别人的话）
to interrupt sb when they are speaking in order to say sth.
3、阻碍；阻挠；干扰
to happen in a way that delays sth or prevents it from happening.
4、介于......之间
to exist between two events or places.
好运咪咪熊
