rare old异乎寻常的, 极度的rareadj.罕见的；珍贵的；煎得嫩的rare earth-based hydrogen storage alloy稀土系贮氢合金rare earth-magnesium intermediate alloy稀土-镁中间合金Rare-earth elements conversion coatings稀土表面转化膜rare-earth ion-doped nonlinear crystal掺稀土离子非线性晶体rare earth-modified cold-fill material稀土改性冷补材料rare earth fluorescent permeating-tracer稀土荧光渗透探伤仪rare earth-silicon-magnesium ferroalloy稀土硅镁铁合金rare earth dioctyldithiophosphate complexes二辛基二硫代磷酸稀土配合物rare earth concentrates containing fluorine含氟稀土精矿rare earth modified organo-montmorillonite稀土改性有机蒙脱土

1. Many rare animals are at the edge of extinction.
   许多世界稀有动物濒临灭绝。
2. Several rare animals have been sighted there in recent years.
   数种稀有动物最近几年在那被发现。