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there may be social and environmental drawbacks to internati

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there may be social and environmental drawbacks to international tourism.
能翻成这可能是国际旅游业对社会和环境的弊端吧.总觉得不是很好
the trail of non-biodegradable litter left behind by international tourists
为什么在left前不用加be动词,这不是被动吗?
there may be social and environmental drawbacks to internati
the trail of non-biodegradable litter left behind by international tourists
如果这个是个整句的话,我个人也是感觉不对的.
你在仔细看看 这句话的结尾是逗号还句号
再问: 后面有跟多一句 the trail of non-biodegradable litter left behind by international tourists and the great amount of fossil fuel used in transportation pose grave environmental threats to the tourist destinations and beyond.
再答: the trail and the great amountof fossil pose grave environmental threats 这两方面对环境造成严重威胁。 of non-biodegradable litter left behind by international tourists 只是修饰the trail 的定语 用OF不需要完整的句子 换成which或是that 要加BE动词的