专家们因在会议上对新观点设限、阻碍创新概念的讨论而受到批评。

The experts were criticized for ___gatekeeping new ideas at the conference, blocking discussions of innovative concepts.

有些资深玩家通过设置严格的规则来进行身份把关，这让很多新手感到被排斥。

Some veteran players practice ___gatekeeping by setting strict rules, making many newcomers feel excluded.