单语范例（未经PONS编辑处理）
英语
- An earthworm has a double transport system composed of coelomic fluid that moves within the fluid-filled coelom and a simple, closed blood circulatory system.en.wikipedia.org
- During the phase immediately after the concussion brain cells need more oxygen and glucose, which is delivered to the brain via the blood circulatory system.theconversation.com
- Years of being active will make a person's heart and blood circulatory system much more efficient and will lower cholesterol.www.nwemail.co.uk
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英语