Solar power/nuclear power , Solar power is cleaner than nuclear power because it doesn’t make dangerous waste., vacuum cleaner/washing machines , A vacuum cleaner is easier to use than a washing machine because it takes less time., Motorbikes/commercial airplanes , Motorbikes are faster than commercial aeroplanes in short distances, but less safe., Computer network/communications satellites, Computer networks are more useful than communications satellites for everyday work and study., vaccinations/antibiotics, Vaccinations are more helpful than antibiotics for stopping some diseases before they start., Space travel/washing machine , Space travel is more exciting than using a washing machine, but also much more expensive!.

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