You don't need a light switch or a light bulb or an iPhoneapp to turn something on or off.
你不需要电灯开关、灯泡或苹果手机应用程序来打开或关闭某些东西。
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The Generation Beyond project also includes an iPhoneapp for iOS providing real time information about weather reports for Mars, and there's also a free deep space course for middle school teachers and students.
You don't need to guess which pair looks best on you — use the eBay Fashion iPhoneapp to try a pair of glasses you're checking out on a picture of your face.