Nowadays there seems to be an app for everything. Different apps can help people improve their study, relax themselves, find their way and so on. They have been part of our life. And here we will recommend some popular apps that are of some help to people.

	Ctrip can be the best helper when you feel it hard to buy the train or airline tickets. You can buy tickets anywhere at anytime.
	Ximalaya Reading has millions of books including poems, short stories, novels and even fairy tales for children. What’s special about it is that you can use it to download book recording that can be listened to. It has more than 1 million valuable resources.
	Google Maps can be downloaded for times when you are away from the Internet. Make your own maps by including directions and points of interest. After creating a custom map( 自定义地图), you can share it with others so they can see where you are going or join you in your trip.
	Quizlet is a(n) ▲ aid app. It is filled with flash cards on many subjects to study. It covers subjects like languages and vocabulary, maths and science, history and geography, etc. Quizlet has games to play and tests to take as well.
	World of Tanks Blitz (坦克世界), a free-to-play online game with over 40 million downloads, bring quick-fire tank fights. “A lot of tanks, a lot of people and a lot of fun.” It will be the best choice to kill your time.

Do you think robots could pass an eighth-grade test? Guess what—they can.

The artificial intelligence (AI) system Aristo recently passed the same eighth-grade science test that some US students take. The New York Times reported. Aristo correctly(正确地) answered 90 percent of the questions on the test.

This is an example of the progress that is being made in AI development. Four years ago, 700 computer scientists tried to develop AI systems that could pass these kinds of exams. None scored higher than 60 percent.

Scientists at the Allen Institute in the US developed the system. Aristo was able to pass the exam because it can not only understand language, but also use logical thinking(逻辑思维)to solve difficult problems. For example, it can understand what a forest fire is and how it could affect(影响) animals.

The system used BERT, a kind of neural(神经的) network technology developed by Google, to answer the questions. BERT has "read" thousands of articles and can understand English. If it looks at a sentence with a missing word, it can correctly guess what the word is. With BERT's help, Aristo "read" many multiple-choice(多选的) questions. Over time, it was able to find logical patterns(逻辑模式).

Aristo’s success means that we might see new AI-based products(人工智能产品), such as search engines(搜索引擎) and databases(数据库) for hospitals. AI systems might be able to better understand users in the future.