Jungle: an unfriendly or dangerous place or situation, especially one where it is very difficult to be successful or to trust anyone 尔虞我诈的环境;危险地带
It's a jungle out there─you've got to be strong to succeed. 那是个弱肉强食的地方 要成功就得是强者.
Sublet: to rent to somebody else all or part of a property that you rent from the owner 转租,分租(租来的物业)
Bulletin board: a place in a computer system where any user can write or read messages 公告牌;布告栏