Apple has said that its latest computer operating system, Mavericks, is available free of charge. The California-based company made the announcement Tuesday at an event in San Francisco.

苹果公司表示，其最新款的电脑操作系统Mavericks免费升级。这家位于加利福尼亚的公司周二在旧金山发布了这一消息。

It also unveiled a new line of Macs and iPads ahead of the holiday shopping season. And here are the specs. A thinner and lighter 13-inch MacBook Pro with Retina display, with up to 9 hours of battery life. But coming with a lower price tag of 1,299 US dollars, 200 bucks cheaper than the previous version.

赶在假日购物季之前，苹果还推出了一系列新款Mac和iPad。我们来看看苹果有哪些更新。采用Retina屏幕的13寸 MacBook Pro更轻更薄，电池续航达到了9个小时，售价1299美元，比之前的版本便宜200美元。

Apple's iPad Air is also about 20 percent slimmer than the previous generation of tablets, starting at 499 US dollars. And a new version of the iPad Mini also comes with the high-definition "Retina Display", which will be available later in November starting at 399 US dollars.

苹果的iPad Air比上一代平板电脑薄了20%，起价499美元。新一代iPad mini采用Retina高清屏幕，最低售价399美元，将于11月开售。