单词: 1.exist; 这样强劲的需求15年前是不存在的. This powerful source of economic demand didn't exist 15 years ago. 2.be; 关于页岩气同样存在争议. Shale gas can be controversial. 这令他们忘记了存在. This makes them forget the being. 3.existence; 对家暴现象存在的认知. Acknowledge the existence of abuse. 短语 存在 The existence of