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YouTube has released a mobile app that shows video clips suitable only for young children. The move is aimed to help parents control what their kids are watching on the Internet.

The app, "YouTube for Kids", features thousands of children-focused channels that provide both entertainment and education. The content is mostly meant for children two to eight years old. Clips are selected by computer and human review.

A wide range of salacious, violent and crude material is available on YouTube, although the site doesn't permit pornographic videos or most other clips containing nudity. It prompted many parents to ask YouTube for a "family-friendly" version of its service.

Besides excluding inappropriate clips, the app also refuses to provide search results on requests including "sex" that are deemed inappropriate for young audiences. It also provides controls that enable parents to determine how long their child can watch videos in a single session.

mobile app n. 移动应用程序 也称手机应用程序或手机app，是指设计给智能型手机、平板电脑和其他移动设备上运行的应用程序。app即application的缩写，所以，正确读音是application的前半部分，而不是分开来读字母A-P-P。

salacious adj. 色情的，淫荡的

crude adj. 粗鲁的，粗俗的

family-friendly adj. 适合家庭生活的，适合全家人一起参与的 如今已成高频委婉语，指代一切不含暴力、性、脏话、毒品等少儿不宜内容的东西。

audience n. 受众（观众、听众、读者等） 这个词的意思大家都懂，但用法未必清楚。audience为集合名词，通常作单数处理，尤其是跟定冠词the搭配、特指某一群体时。另一方面，audience也可以加s，以复数形式出现，前面不加冠词，其效果相当于viewers/listeners/readers。
例句：
I sang my heart out, but the audience was not feeling it. There was hardly any applause when I was done. It was frustrating, to say the least. （我唱得非常投入，可现场观众完全不买账。演唱结束的时候几乎听不到掌声。真是让人沮丧。）
Don’t ever say things like “My book is for smart, mature audiences.” That’s essentially telling people if they don’t like your book, they are stupid and childish. First of all, RUDE! Do you honestly think someone will fork over their hard-earned money after being insulted by you? Second of all, different people have different tastes. You have no right to judge people who don’t like the same things you do. （千万别说“我的书适合聪明、成熟的读者”这样的话。这等于告诉人们，如果不喜欢你的书，他们就是傻帽、小儿科！首先，这很没礼貌。你觉得会有人在被你侮辱了之后还花钱买你的东西吗？其次，不同的人有不同的口味，无所谓对错。所以你无权指责跟你喜好不同的人。）