infrequent

adj.

稀少的；罕见的；

1. Muggings are relatively infrequent in this area.
   在这个地区行凶抢劫事件相对少见。
2. This year our country produced the infrequent pluvial calamity on the history.
   今年我国发生了历史上罕见的洪水灾害。
3. Primary abscess of the omentum is an infrequent disease entity.
   原发性大网膜脓疡是一种罕见的疾病。

Comparing Large, Infrequent Disturbances: What Have We Learned?
Infrequent events transiently activate human prefrontal and parietal cortex as measured by functional MRI.
Ecosystem Management in the Context of Large, Infrequent Disturbances
Risk measurement when shares are subject to infrequent trading : Comment
Factors Influencing Succession: Lessons from Large, Infrequent Natural Disturbances
Landscape Patterns and Legacies Resulting from Large, Infrequent Forest Disturbances
Estimating the suspended sediment loads of rivers in the LOIS study area using infrequent samples
Endogenous potentials generated in the human hippocampal formation and amygdala by infrequent events.
The JAK2 V617F activating tyrosine kinase mutation is an infrequent event in both "atypical"myeloproliferative disorders and myelod...
Protein C deficiency in a controlled series of unselected outpatients: an infrequent but clear risk factor for venous thrombosis (Le...