优质科普作者
作者介绍
In recent years, the concept of "low carbon" has become a hot topic around the world As environmental problems
当我们出国旅行或在超市里挑选进口食品时,常常会看到包装袋上标注着一个英文单词——"Calories"。这个看似简单的词汇,实际上蕴含着丰富的