有了好吃的奖励，马对实验者“表现出更积极主动”的行为，又嗅又舔，”研究人员写道。
With tasty rewards, the horses "displayed more 'positive' behaviors toward the experimenter, such as sniffing and licking, " the researchers wrote.
首尔国立大学干细胞实验室附属RNL生物科技公司说，这几只嗅癌犬于三周前出生，并将于九月被送往日本接受训练。
RNL Bio, affiliated with the stem cell lab of Seoul National University, said the puppies were born three weeks ago and would be sent to Japan in September for training.
这主要是由于鼻腔的复杂结构及嗅区的特殊生理位置，为直接的嗅觉实验研究带来了不少困难。
The main reason is the complicated anatomic structure of the nasal cavity and the special physiological location of the olfactory region, which has caused much trouble in direct experiment studies.
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