The scientist broke new ground in his book about rare animals.这位科学家在他那本有关珍稀动物的著作中有独创见解。These rare animals may soon disappear altogether.这些珍稀动物可能不久就会全部灭绝。All four countries have adopted the declaration against hunting these rare animals.四国都通过了反对捕猎这些珍稀动物的宣言。