慢速英语:New Device Shows Human Body As Never Seen Before

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短语讲解：

1. PET stands for Positron Emission Tomography.

stand for 代表; 为…而奋斗
例句：You both stand for freedom.
你们俩都是自由的象征。

2. We’re a system of organs and all the organs interact with each other.

each other 互相
例句：All things are interrelated and interact on each other.
一切事物互相联系并相互作用。