因此，乌龟是曾经往返于陆地和水中生存的代表性物种。

Tortoises therefore represent a remarkable double return.

youdao

科学家们已致力于从人产生的垃圾中生产塑料，藻类以及奶类，所以当一家公司正试图利用二氧化碳生产塑料便不足为奇。

Scientists are already working on making plastic from human waste, algae and milk, so it shouldn't come as a surprise that one company is working on making it from carbon dioxide.

youdao

此项研究显示出了时间性衰老和生物性衰老的区别，其中生物性衰老取决于人体基因组成和生活方式，例如饮食组成和是否吸烟。

The research highlights the difference between chronological age and biological age, the latter of which is determined by our genetic makeup and lifestyle factors, such as diet and smoking.

youdao