短语动词学习（R）
rip off (separable): cheat; take advantage of; charge too much.\"Don't even think about buying a car there. They'll rip you off.\"
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round off (separable): change from a fraction to the nearest whole number.
\"Round all prices off to the closest whole-dollar amounts. For example, round $33.73 off to $34.00.\"
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run into (inseparable): meet by chance.
\"Yesterday at the supermarket, Jan ran into her former roommate. Before yesterday, they hadn't seen each other for nearly five years.\"
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run out of (inseparable): use the last of.
\"On the way home from work, Art ran out of gas.\"
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