iPhone智能手机只能通过中国第二大移动通信运营商——中国联通(China Unicom)合法买到。

The iPhone has been legally available only via China Unicom, the country's second-largest mobile operator.

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和迭代器不同，不需要先移动指针（使用 next()）来进入合法的状态。

Unlike an iterator, the cursor need not be advanced first (using next()) in order to get into a valid state.

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如果没有这样的合法位置存在，则该生物仍停留在开始移动的位置。

If no such legal position exists, leave the creature in its starting space.

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