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The new MacBook borrows features from the ultra-slim MacBook Air. It’s only slightly thicker, and like the Air, lacks a DVD drive. Instead of a spinning hard drive, it uses flash memory for storage. In the most radical departure from past PC designs, it lacks an Ethernet port. Those who don’t want to use Wi-Fi to connect to the Internet will have to buy an adapter that goes into the MacBook’s “Thunderbolt” port.

Apple’s other MacBooks are being updated with the latest processors from Intel Corp. Apple will still sell a more traditional 15-inch MacBook Pro, with a standard display.

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Peter Svensson contributed from New York.