你在食物链的哪一层？

Where are you on the food chain?

youdao

青少年们爬了数十层楼梯，为困在高层建筑中的老人们送去水和食物。

Teenagers climbed dozens of flights of stairs to deliver water and food to elderly people trapped in high-rise buildings.

youdao

青少年爬上几十层楼梯，给困在高层建筑中无助的老年人送水和食物。

Teenagers climbed dozens of flights of stairs to deliver water and food to elderly people trapped in powerless high-rise buildings.

youdao

That is, if it can be absorbed through this layer of epithelium.

就是说食物如果要能够被上皮细胞层吸收

耶鲁公开课 - 生物医学工程探索课程节选

Your stomach is a very complex organ that has a muscle layer, it has an epithelial layer which is the interface with food that comes in, and it also has a nervous system, so does the heart.

你的胃是一个非常复杂的器官,它拥有一个肌肉层,有一个与摄入的食物,相接触的表皮层,也有一套神经系统,心脏也有

耶鲁公开课 - 生物医学工程探索课程节选