元素周期表中英对照（Periodic Table of the Elements）

1、视频 .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed...

Sentence Patterns（句子模型）“Sentence patterns” is just another way talk about the way a sentence is put together; the order of the elements（要素） in the sentence; sentence construction（结构）. Some sources ...