non-existent

adj.

不存在的；

1. You have no need to fear a non- existent supernatural devil.
   你无需害怕并不存在的超凡恶魔。
2. Inviting the fire-brigade to put out a non- existent fire is a crude form of deception which no self-respecting student would ever indulge in.
   请火警来扑灭一场不存在的火灾，这是一种低级的骗局，有自尊心的大学生决不沉湎于此。

Method for predicting the future occurrence of clinically occult or non-existent medical conditions
The calcium and the oxygen paradox: non-existent on the cellular level.
A METHOD FOR INCREASING THE VIGOR AND/OR CROP YIELD OF AGRICULTURAL PLANTS UNDER ESSENTIALLY NON-EXISTENT PATHOGEN PRESSURE
Triethylsilyl Perfluoro-Tetraphenylborate, [Et3Si+][F20-BPh4−], a widely used Non-Existent Compound
Quantification and Non-Existent Objects
The problem of non-existents
Seeing non-existent events: effects of environmental conditions, schizotypal symptoms, and sub-clinical characteristics.
The critical densimetric Froude number of subaqueous gravity currents can be non-unity or non-existent.
Non-Existent Objects and Epistemological Ontology
Critical review of Parsons' non-existent objects