translation.en: Whenever it comes up to the midpoint, it pauses, it carefully scans the odor interface as if it was sniffing out its environment, and then it turns around.
translation.zh: 每当它来到中心点， 它会停下， 谨慎地检查气味的接合点， 就好像在打探周遭的环境， 然后它会回头。