电子课程

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为什么原子核被认为带正电而电子云带负电？

Improve your vocabulary and reading skills with this lesson about stars and celebrities.

有机化合物的分类有助于识别材料并了解其特性。

了解一下伊格纳兹·塞梅尔维斯 ，他是十九世纪著名的匈牙利医生，被人们称为“母亲们的救世主”。

了解甲烷的特征和经济意义以及其来源和排放的后果。

In this lesson, we are going to learn how to express possession.

In this lesson, you are going to learn how and why the passive voice is used in English.

Let’s revise the Past Simple and Past Continuous.

In this lesson, you are going to learn how to describe physical appearance.

Improve your work-related vocabulary by reading about some well-known professions.

In this lesson, you can find exercises that can help you learn words for different farm animals.

Improve your vocabulary by learning about some of the most important environmental problems.

了解计算机科学先驱艾伦·图灵。

In this lesson, you are going to learn about Thanksgiving that is celebrated mainly in the US and Canada.

This lesson is going to show you how to speak about pros and cons while helping to improve your vocabulary for money.

Step into the magical world of fairy tales and boost your vocabulary.

Improve your writing skills with this lesson about effective blog writing.

Immerse yourself in the captivating world of books while you’re improving your vocabulary about reading.

您可以了解饱和烃的分子结构和命名法。

您可以了解法国浪漫主义最重要的诗人、小说家和剧作家之一。

This digital lesson will greatly enhance your vocabulary and also provide some exciting speaking topics related to films.

This lesson can help you become an expert in writing film or book reviews.

Enrich your vocabulary with this lesson about living in the city compared to living in the country.

In this lesson, we are going to improve vocabulary skills while checking out interesting facts about Valentine’s Day.