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The catalytic converter and exhaust muffler reduce gas pollution effectively , but at the nean time . They destroy the power and economy of the engine .
催化转化器和排气消声器有效的减轻了废气污染，降低了排气噪声，但同时也损失了发动机的动力性和经济性。
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Mr Nean MacCannell , a socio-anthropologist at UC Davis , regards tourism as a modern phenomenon .
美国加州大学戴维斯分校的社会人类学家马康纳认为旅游是一种现代现象。